2 * Copyright (C) 2008 Nokia Corporation. All rights reserved.
3 * Contact: Stefan Kost <stefan.kost@nokia.com>
4 * Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>.
5 * Copyright (C) 2011, Hewlett-Packard Development Company, L.P.
6 * Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd.
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
25 * SECTION:gstbaseparse
26 * @short_description: Base class for stream parsers
27 * @see_also: #GstBaseTransform
29 * This base class is for parser elements that process data and splits it
30 * into separate audio/video/whatever frames.
34 * <listitem><para>provides one sink pad and one source pad</para></listitem>
35 * <listitem><para>handles state changes</para></listitem>
36 * <listitem><para>can operate in pull mode or push mode</para></listitem>
37 * <listitem><para>handles seeking in both modes</para></listitem>
38 * <listitem><para>handles events (SEGMENT/EOS/FLUSH)</para></listitem>
40 * handles queries (POSITION/DURATION/SEEKING/FORMAT/CONVERT)
42 * <listitem><para>handles flushing</para></listitem>
45 * The purpose of this base class is to provide the basic functionality of
46 * a parser and share a lot of rather complex code.
48 * Description of the parsing mechanism:
51 * <itemizedlist><title>Set-up phase</title>
53 * GstBaseParse calls @start to inform subclass that data processing is
57 * GstBaseParse class calls @set_sink_caps to inform the subclass about
58 * incoming sinkpad caps. Subclass could already set the srcpad caps
59 * accordingly, but this might be delayed until calling
60 * gst_base_parse_finish_frame() with a non-queued frame.
63 * At least at this point subclass needs to tell the GstBaseParse class
64 * how big data chunks it wants to receive (min_frame_size). It can do
65 * this with gst_base_parse_set_min_frame_size().
68 * GstBaseParse class sets up appropriate data passing mode (pull/push)
69 * and starts to process the data.
75 * <title>Parsing phase</title>
77 * GstBaseParse gathers at least min_frame_size bytes of data either
78 * by pulling it from upstream or collecting buffers in an internal
82 * A buffer of (at least) min_frame_size bytes is passed to subclass with
83 * @handle_frame. Subclass checks the contents and can optionally
84 * return GST_FLOW_OK along with an amount of data to be skipped to find
85 * a valid frame (which will result in a subsequent DISCONT).
86 * If, otherwise, the buffer does not hold a complete frame,
87 * @handle_frame can merely return and will be called again when additional
88 * data is available. In push mode this amounts to an
89 * additional input buffer (thus minimal additional latency), in pull mode
90 * this amounts to some arbitrary reasonable buffer size increase.
91 * Of course, gst_base_parse_set_min_frame_size() could also be used if a
92 * very specific known amount of additional data is required.
93 * If, however, the buffer holds a complete valid frame, it can pass
94 * the size of this frame to gst_base_parse_finish_frame().
95 * If acting as a converter, it can also merely indicate consumed input data
96 * while simultaneously providing custom output data.
97 * Note that baseclass performs some processing (such as tracking
98 * overall consumed data rate versus duration) for each finished frame,
99 * but other state is only updated upon each call to @handle_frame
100 * (such as tracking upstream input timestamp).
102 * Subclass is also responsible for setting the buffer metadata
103 * (e.g. buffer timestamp and duration, or keyframe if applicable).
104 * (although the latter can also be done by GstBaseParse if it is
105 * appropriately configured, see below). Frame is provided with
106 * timestamp derived from upstream (as much as generally possible),
107 * duration obtained from configuration (see below), and offset
108 * if meaningful (in pull mode).
110 * Note that @check_valid_frame might receive any small
111 * amount of input data when leftover data is being drained (e.g. at EOS).
114 * As part of finish frame processing,
115 * just prior to actually pushing the buffer in question,
116 * it is passed to @pre_push_frame which gives subclass yet one
117 * last chance to examine buffer metadata, or to send some custom (tag)
118 * events, or to perform custom (segment) filtering.
121 * During the parsing process GstBaseParseClass will handle both srcpad
122 * and sinkpad events. They will be passed to subclass if @event or
123 * @src_event callbacks have been provided.
128 * <itemizedlist><title>Shutdown phase</title>
130 * GstBaseParse class calls @stop to inform the subclass that data
131 * parsing will be stopped.
137 * Subclass is responsible for providing pad template caps for
138 * source and sink pads. The pads need to be named "sink" and "src". It also
139 * needs to set the fixed caps on srcpad, when the format is ensured (e.g.
140 * when base class calls subclass' @set_sink_caps function).
142 * This base class uses #GST_FORMAT_DEFAULT as a meaning of frames. So,
143 * subclass conversion routine needs to know that conversion from
144 * #GST_FORMAT_TIME to #GST_FORMAT_DEFAULT must return the
145 * frame number that can be found from the given byte position.
147 * GstBaseParse uses subclasses conversion methods also for seeking (or
148 * otherwise uses its own default one, see also below).
150 * Subclass @start and @stop functions will be called to inform the beginning
151 * and end of data processing.
153 * Things that subclass need to take care of:
155 * <listitem><para>Provide pad templates</para></listitem>
157 * Fixate the source pad caps when appropriate
160 * Inform base class how big data chunks should be retrieved. This is
161 * done with gst_base_parse_set_min_frame_size() function.
164 * Examine data chunks passed to subclass with @handle_frame and pass
165 * proper frame(s) to gst_base_parse_finish_frame(), and setting src pad
166 * caps and timestamps on frame.
168 * <listitem><para>Provide conversion functions</para></listitem>
170 * Update the duration information with gst_base_parse_set_duration()
173 * Optionally passthrough using gst_base_parse_set_passthrough()
176 * Configure various baseparse parameters using
177 * gst_base_parse_set_average_bitrate(), gst_base_parse_set_syncable()
178 * and gst_base_parse_set_frame_rate().
181 * In particular, if subclass is unable to determine a duration, but
182 * parsing (or specs) yields a frames per seconds rate, then this can be
183 * provided to GstBaseParse to enable it to cater for
184 * buffer time metadata (which will be taken from upstream as much as
185 * possible). Internally keeping track of frame durations and respective
186 * sizes that have been pushed provides GstBaseParse with an estimated
187 * bitrate. A default @convert (used if not overridden) will then use these
188 * rates to perform obvious conversions. These rates are also used to
189 * update (estimated) duration at regular frame intervals.
196 * - In push mode provide a queue of adapter-"queued" buffers for upstream
198 * - Queue buffers/events until caps are set
208 #include <gst/base/gstadapter.h>
210 #include "gstbaseparse.h"
212 /* FIXME: get rid of old GstIndex code */
213 #include "gstindex.h"
214 #include "gstindex.c"
215 #include "gstmemindex.c"
217 #define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
219 #define MIN_FRAMES_TO_POST_BITRATE 10
220 #define TARGET_DIFFERENCE (20 * GST_SECOND)
221 #define MAX_INDEX_ENTRIES 4096
223 GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
224 #define GST_CAT_DEFAULT gst_base_parse_debug
226 /* Supported formats */
227 static const GstFormat fmtlist[] = {
234 #define GST_BASE_PARSE_GET_PRIVATE(obj) \
235 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate))
237 struct _GstBaseParsePrivate
244 GstFormat duration_fmt;
245 gint64 estimated_duration;
246 gint64 estimated_drift;
248 guint min_frame_size;
249 gboolean disable_passthrough;
250 gboolean passthrough;
251 gboolean pts_interpolate;
254 gboolean has_timing_info;
255 guint fps_num, fps_den;
256 gint update_interval;
258 guint lead_in, lead_out;
259 GstClockTime lead_in_ts, lead_out_ts;
260 GstClockTime min_latency, max_latency;
268 GstClockTime next_pts;
269 GstClockTime next_dts;
270 GstClockTime prev_pts;
271 GstClockTime prev_dts;
272 GstClockTime frame_duration;
273 gboolean seen_keyframe;
279 guint64 data_bytecount;
280 guint64 acc_duration;
281 GstClockTime first_frame_pts;
282 GstClockTime first_frame_dts;
283 gint64 first_frame_offset;
285 gboolean post_min_bitrate;
286 gboolean post_avg_bitrate;
287 gboolean post_max_bitrate;
291 guint posted_avg_bitrate;
293 /* frames/buffers that are queued and ready to go on OK */
294 GQueue queued_frames;
298 /* index entry storage, either ours or provided */
304 /* seek table entries only maintained if upstream is BYTE seekable */
305 gboolean upstream_seekable;
306 gboolean upstream_has_duration;
307 gint64 upstream_size;
308 GstFormat upstream_format;
309 /* minimum distance between two index entries */
310 GstClockTimeDiff idx_interval;
311 guint64 idx_byte_interval;
312 /* ts and offset of last entry added */
313 GstClockTime index_last_ts;
314 gint64 index_last_offset;
315 gboolean index_last_valid;
317 /* timestamps currently produced are accurate, e.g. started from 0 onwards */
318 gboolean exact_position;
319 /* seek events are temporarily kept to match them with newsegments */
320 GSList *pending_seeks;
322 /* reverse playback */
323 GSList *buffers_pending;
324 GSList *buffers_head;
325 GSList *buffers_queued;
326 GSList *buffers_send;
327 GstClockTime last_pts;
328 GstClockTime last_dts;
331 /* Pending serialized events */
332 GList *pending_events;
333 /* Newsegment event to be sent after SEEK */
334 gboolean pending_segment;
336 /* offset of last parsed frame/data */
338 /* force a new frame, regardless of offset */
340 /* whether we are merely scanning for a frame */
342 /* ... and resulting frame, if any */
343 GstBaseParseFrame *scanned_frame;
345 /* TRUE if we're still detecting the format, i.e.
346 * if ::detect() is still called for future buffers */
348 GList *detect_buffers;
349 guint detect_buffers_size;
351 /* if TRUE, a STREAM_START event needs to be pushed */
352 gboolean push_stream_start;
355 typedef struct _GstBaseParseSeek
360 GstClockTime start_ts;
363 #define DEFAULT_DISABLE_PASSTHROUGH FALSE
368 PROP_DISABLE_PASSTHROUGH,
372 #define GST_BASE_PARSE_INDEX_LOCK(parse) \
373 g_mutex_lock (&parse->priv->index_lock);
374 #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
375 g_mutex_unlock (&parse->priv->index_lock);
377 static GstElementClass *parent_class = NULL;
379 static void gst_base_parse_class_init (GstBaseParseClass * klass);
380 static void gst_base_parse_init (GstBaseParse * parse,
381 GstBaseParseClass * klass);
384 gst_base_parse_get_type (void)
386 static volatile gsize base_parse_type = 0;
388 if (g_once_init_enter (&base_parse_type)) {
389 static const GTypeInfo base_parse_info = {
390 sizeof (GstBaseParseClass),
391 (GBaseInitFunc) NULL,
392 (GBaseFinalizeFunc) NULL,
393 (GClassInitFunc) gst_base_parse_class_init,
396 sizeof (GstBaseParse),
398 (GInstanceInitFunc) gst_base_parse_init,
402 _type = g_type_register_static (GST_TYPE_ELEMENT,
403 "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
404 g_once_init_leave (&base_parse_type, _type);
406 return (GType) base_parse_type;
409 static void gst_base_parse_finalize (GObject * object);
411 static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
412 GstStateChange transition);
413 static void gst_base_parse_reset (GstBaseParse * parse);
416 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
417 static GstIndex *gst_base_parse_get_index (GstElement * element);
420 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad,
422 static gboolean gst_base_parse_sink_activate_mode (GstPad * pad,
423 GstObject * parent, GstPadMode mode, gboolean active);
424 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
426 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
428 static void gst_base_parse_set_property (GObject * object, guint prop_id,
429 const GValue * value, GParamSpec * pspec);
430 static void gst_base_parse_get_property (GObject * object, guint prop_id,
431 GValue * value, GParamSpec * pspec);
433 static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
435 static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
438 static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
440 static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
443 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
445 static void gst_base_parse_loop (GstPad * pad);
447 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
448 GstBaseParseFrame * frame);
450 static gboolean gst_base_parse_sink_event_default (GstBaseParse * parse,
453 static gboolean gst_base_parse_src_event_default (GstBaseParse * parse,
456 static gboolean gst_base_parse_sink_query_default (GstBaseParse * parse,
458 static gboolean gst_base_parse_src_query_default (GstBaseParse * parse,
461 static void gst_base_parse_drain (GstBaseParse * parse);
463 static void gst_base_parse_post_bitrates (GstBaseParse * parse,
464 gboolean post_min, gboolean post_avg, gboolean post_max);
466 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
467 GstClockTime time, gboolean before, GstClockTime * _ts);
468 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
469 GstClockTime * _time, gint64 * _offset);
471 static GstFlowReturn gst_base_parse_start_fragment (GstBaseParse * parse);
472 static GstFlowReturn gst_base_parse_finish_fragment (GstBaseParse * parse,
475 static inline GstFlowReturn gst_base_parse_check_sync (GstBaseParse * parse);
477 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
479 static void gst_base_parse_push_pending_events (GstBaseParse * parse);
482 gst_base_parse_clear_queues (GstBaseParse * parse)
484 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
485 g_slist_free (parse->priv->buffers_queued);
486 parse->priv->buffers_queued = NULL;
487 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
489 g_slist_free (parse->priv->buffers_pending);
490 parse->priv->buffers_pending = NULL;
491 g_slist_foreach (parse->priv->buffers_head, (GFunc) gst_buffer_unref, NULL);
492 g_slist_free (parse->priv->buffers_head);
493 parse->priv->buffers_head = NULL;
494 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
495 g_slist_free (parse->priv->buffers_send);
496 parse->priv->buffers_send = NULL;
498 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
499 g_list_free (parse->priv->detect_buffers);
500 parse->priv->detect_buffers = NULL;
501 parse->priv->detect_buffers_size = 0;
503 g_queue_foreach (&parse->priv->queued_frames,
504 (GFunc) gst_base_parse_frame_free, NULL);
505 g_queue_clear (&parse->priv->queued_frames);
507 gst_buffer_replace (&parse->priv->cache, NULL);
509 g_list_foreach (parse->priv->pending_events, (GFunc) gst_event_unref, NULL);
510 g_list_free (parse->priv->pending_events);
511 parse->priv->pending_events = NULL;
512 parse->priv->pending_segment = FALSE;
516 gst_base_parse_finalize (GObject * object)
518 GstBaseParse *parse = GST_BASE_PARSE (object);
520 g_object_unref (parse->priv->adapter);
522 if (parse->priv->cache) {
523 gst_buffer_unref (parse->priv->cache);
524 parse->priv->cache = NULL;
527 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
529 g_list_free (parse->priv->pending_events);
530 parse->priv->pending_events = NULL;
531 parse->priv->pending_segment = FALSE;
533 if (parse->priv->index) {
534 gst_object_unref (parse->priv->index);
535 parse->priv->index = NULL;
537 g_mutex_clear (&parse->priv->index_lock);
539 gst_base_parse_clear_queues (parse);
541 G_OBJECT_CLASS (parent_class)->finalize (object);
545 gst_base_parse_class_init (GstBaseParseClass * klass)
547 GObjectClass *gobject_class;
548 GstElementClass *gstelement_class;
550 gobject_class = G_OBJECT_CLASS (klass);
551 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
552 parent_class = g_type_class_peek_parent (klass);
554 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
555 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_base_parse_set_property);
556 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_base_parse_get_property);
559 * GstBaseParse:disable-passthrough:
561 * If set to #TRUE, baseparse will unconditionally force parsing of the
562 * incoming data. This can be required in the rare cases where the incoming
563 * side-data (caps, pts, dts, ...) is not trusted by the user and wants to
564 * force validation and parsing of the incoming data.
565 * If set to #FALSE, decision of whether to parse the data or not is up to
566 * the implementation (standard behaviour).
568 g_object_class_install_property (gobject_class, PROP_DISABLE_PASSTHROUGH,
569 g_param_spec_boolean ("disable-passthrough", "Disable passthrough",
570 "Force processing (disables passthrough)",
571 DEFAULT_DISABLE_PASSTHROUGH,
572 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
574 gstelement_class = (GstElementClass *) klass;
575 gstelement_class->change_state =
576 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
579 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
580 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
583 /* Default handlers */
584 klass->sink_event = gst_base_parse_sink_event_default;
585 klass->src_event = gst_base_parse_src_event_default;
586 klass->sink_query = gst_base_parse_sink_query_default;
587 klass->src_query = gst_base_parse_src_query_default;
588 klass->convert = gst_base_parse_convert_default;
590 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
591 "baseparse element");
595 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
597 GstPadTemplate *pad_template;
599 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
601 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
604 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
605 g_return_if_fail (pad_template != NULL);
606 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
607 gst_pad_set_event_function (parse->sinkpad,
608 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
609 gst_pad_set_query_function (parse->sinkpad,
610 GST_DEBUG_FUNCPTR (gst_base_parse_sink_query));
611 gst_pad_set_chain_function (parse->sinkpad,
612 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
613 gst_pad_set_activate_function (parse->sinkpad,
614 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
615 gst_pad_set_activatemode_function (parse->sinkpad,
616 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_mode));
617 GST_PAD_SET_PROXY_ALLOCATION (parse->sinkpad);
618 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
620 GST_DEBUG_OBJECT (parse, "sinkpad created");
623 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
624 g_return_if_fail (pad_template != NULL);
625 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
626 gst_pad_set_event_function (parse->srcpad,
627 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
628 gst_pad_set_query_function (parse->srcpad,
629 GST_DEBUG_FUNCPTR (gst_base_parse_src_query));
630 gst_pad_use_fixed_caps (parse->srcpad);
631 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
632 GST_DEBUG_OBJECT (parse, "src created");
634 g_queue_init (&parse->priv->queued_frames);
636 parse->priv->adapter = gst_adapter_new ();
638 parse->priv->pad_mode = GST_PAD_MODE_NONE;
640 g_mutex_init (&parse->priv->index_lock);
643 gst_base_parse_reset (parse);
644 GST_DEBUG_OBJECT (parse, "init ok");
646 GST_OBJECT_FLAG_SET (parse, GST_ELEMENT_FLAG_INDEXABLE);
650 gst_base_parse_set_property (GObject * object, guint prop_id,
651 const GValue * value, GParamSpec * pspec)
653 GstBaseParse *parse = GST_BASE_PARSE (object);
656 case PROP_DISABLE_PASSTHROUGH:
657 parse->priv->disable_passthrough = g_value_get_boolean (value);
660 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
666 gst_base_parse_get_property (GObject * object, guint prop_id, GValue * value,
669 GstBaseParse *parse = GST_BASE_PARSE (object);
672 case PROP_DISABLE_PASSTHROUGH:
673 g_value_set_boolean (value, parse->priv->disable_passthrough);
676 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
681 static GstBaseParseFrame *
682 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
684 GstBaseParseFrame *copy;
686 copy = g_slice_dup (GstBaseParseFrame, frame);
687 copy->buffer = gst_buffer_ref (frame->buffer);
688 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
690 GST_TRACE ("copied frame %p -> %p", frame, copy);
696 gst_base_parse_frame_free (GstBaseParseFrame * frame)
698 GST_TRACE ("freeing frame %p", frame);
701 gst_buffer_unref (frame->buffer);
702 frame->buffer = NULL;
705 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
706 g_slice_free (GstBaseParseFrame, frame);
708 memset (frame, 0, sizeof (*frame));
712 G_DEFINE_BOXED_TYPE (GstBaseParseFrame, gst_base_parse_frame,
713 (GBoxedCopyFunc) gst_base_parse_frame_copy,
714 (GBoxedFreeFunc) gst_base_parse_frame_free);
717 * gst_base_parse_frame_init:
718 * @frame: #GstBaseParseFrame.
720 * Sets a #GstBaseParseFrame to initial state. Currently this means
721 * all public fields are zero-ed and a private flag is set to make
722 * sure gst_base_parse_frame_free() only frees the contents but not
723 * the actual frame. Use this function to initialise a #GstBaseParseFrame
724 * allocated on the stack.
727 gst_base_parse_frame_init (GstBaseParseFrame * frame)
729 memset (frame, 0, sizeof (GstBaseParseFrame));
730 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
731 GST_TRACE ("inited frame %p", frame);
735 * gst_base_parse_frame_new:
736 * @buffer: (transfer none): a #GstBuffer
738 * @overhead: number of bytes in this frame which should be counted as
739 * metadata overhead, ie. not used to calculate the average bitrate.
740 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
742 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
743 * elements written in C should usually allocate the frame on the stack and
744 * then use gst_base_parse_frame_init() to initialise it.
746 * Returns: a newly-allocated #GstBaseParseFrame. Free with
747 * gst_base_parse_frame_free() when no longer needed.
750 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
753 GstBaseParseFrame *frame;
755 frame = g_slice_new0 (GstBaseParseFrame);
756 frame->buffer = gst_buffer_ref (buffer);
758 GST_TRACE ("created frame %p", frame);
763 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
766 gst_buffer_replace (&frame->buffer, buf);
770 /* set flags one by one for clarity */
771 if (G_UNLIKELY (parse->priv->drain))
772 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
774 /* losing sync is pretty much a discont (and vice versa), no ? */
775 if (G_UNLIKELY (parse->priv->discont))
776 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
780 gst_base_parse_reset (GstBaseParse * parse)
782 GST_OBJECT_LOCK (parse);
783 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
784 parse->priv->duration = -1;
785 parse->priv->min_frame_size = 1;
786 parse->priv->discont = TRUE;
787 parse->priv->flushing = FALSE;
788 parse->priv->offset = 0;
789 parse->priv->sync_offset = 0;
790 parse->priv->update_interval = -1;
791 parse->priv->fps_num = parse->priv->fps_den = 0;
792 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
793 parse->priv->lead_in = parse->priv->lead_out = 0;
794 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
795 parse->priv->bitrate = 0;
796 parse->priv->framecount = 0;
797 parse->priv->bytecount = 0;
798 parse->priv->acc_duration = 0;
799 parse->priv->first_frame_pts = GST_CLOCK_TIME_NONE;
800 parse->priv->first_frame_dts = GST_CLOCK_TIME_NONE;
801 parse->priv->first_frame_offset = -1;
802 parse->priv->estimated_duration = -1;
803 parse->priv->estimated_drift = 0;
804 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
805 parse->priv->next_dts = 0;
806 parse->priv->syncable = TRUE;
807 parse->priv->disable_passthrough = DEFAULT_DISABLE_PASSTHROUGH;
808 parse->priv->passthrough = FALSE;
809 parse->priv->pts_interpolate = TRUE;
810 parse->priv->infer_ts = TRUE;
811 parse->priv->has_timing_info = FALSE;
812 parse->priv->post_min_bitrate = TRUE;
813 parse->priv->post_avg_bitrate = TRUE;
814 parse->priv->post_max_bitrate = TRUE;
815 parse->priv->min_bitrate = G_MAXUINT;
816 parse->priv->max_bitrate = 0;
817 parse->priv->avg_bitrate = 0;
818 parse->priv->posted_avg_bitrate = 0;
820 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
821 parse->priv->index_last_offset = -1;
822 parse->priv->index_last_valid = TRUE;
823 parse->priv->upstream_seekable = FALSE;
824 parse->priv->upstream_size = 0;
825 parse->priv->upstream_has_duration = FALSE;
826 parse->priv->upstream_format = GST_FORMAT_UNDEFINED;
827 parse->priv->idx_interval = 0;
828 parse->priv->idx_byte_interval = 0;
829 parse->priv->exact_position = TRUE;
830 parse->priv->seen_keyframe = FALSE;
832 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
833 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
834 parse->priv->last_offset = 0;
836 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
838 g_list_free (parse->priv->pending_events);
839 parse->priv->pending_events = NULL;
840 parse->priv->pending_segment = FALSE;
842 if (parse->priv->cache) {
843 gst_buffer_unref (parse->priv->cache);
844 parse->priv->cache = NULL;
847 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
848 g_slist_free (parse->priv->pending_seeks);
849 parse->priv->pending_seeks = NULL;
851 if (parse->priv->adapter)
852 gst_adapter_clear (parse->priv->adapter);
854 parse->priv->new_frame = TRUE;
856 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
857 g_list_free (parse->priv->detect_buffers);
858 parse->priv->detect_buffers = NULL;
859 parse->priv->detect_buffers_size = 0;
860 GST_OBJECT_UNLOCK (parse);
863 /* gst_base_parse_parse_frame:
864 * @parse: #GstBaseParse.
865 * @buffer: #GstBuffer.
867 * Default callback for parse_frame.
870 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
872 GstBuffer *buffer = frame->buffer;
874 if (!GST_BUFFER_PTS_IS_VALID (buffer) &&
875 GST_CLOCK_TIME_IS_VALID (parse->priv->next_pts)) {
876 GST_BUFFER_PTS (buffer) = parse->priv->next_pts;
878 if (!GST_BUFFER_DTS_IS_VALID (buffer) &&
879 GST_CLOCK_TIME_IS_VALID (parse->priv->next_dts)) {
880 GST_BUFFER_DTS (buffer) = parse->priv->next_dts;
882 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
883 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
884 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
889 /* gst_base_parse_convert:
890 * @parse: #GstBaseParse.
891 * @src_format: #GstFormat describing the source format.
892 * @src_value: Source value to be converted.
893 * @dest_format: #GstFormat defining the converted format.
894 * @dest_value: Pointer where the conversion result will be put.
896 * Converts using configured "convert" vmethod in #GstBaseParse class.
898 * Returns: TRUE if conversion was successful.
901 gst_base_parse_convert (GstBaseParse * parse,
902 GstFormat src_format,
903 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
905 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
908 g_return_val_if_fail (dest_value != NULL, FALSE);
913 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
915 #ifndef GST_DISABLE_GST_DEBUG
918 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
919 GST_LOG_OBJECT (parse,
920 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
921 GST_TIME_ARGS (src_value), *dest_value);
922 } else if (dest_format == GST_FORMAT_TIME &&
923 src_format == GST_FORMAT_BYTES) {
924 GST_LOG_OBJECT (parse,
925 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
926 src_value, GST_TIME_ARGS (*dest_value));
928 GST_LOG_OBJECT (parse,
929 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
930 GST_STR_NULL (gst_format_get_name (src_format)),
931 GST_STR_NULL (gst_format_get_name (dest_format)),
932 src_value, *dest_value);
935 GST_DEBUG_OBJECT (parse, "conversion failed");
943 /* gst_base_parse_sink_event:
944 * @pad: #GstPad that received the event.
945 * @event: #GstEvent to be handled.
947 * Handler for sink pad events.
949 * Returns: TRUE if the event was handled.
952 gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
954 GstBaseParse *parse = GST_BASE_PARSE (parent);
955 GstBaseParseClass *bclass = GST_BASE_PARSE_GET_CLASS (parse);
958 ret = bclass->sink_event (parse, event);
964 /* gst_base_parse_sink_event_default:
965 * @parse: #GstBaseParse.
966 * @event: #GstEvent to be handled.
968 * Element-level event handler function.
970 * The event will be unreffed only if it has been handled and this
971 * function returns %TRUE
973 * Returns: %TRUE if the event was handled and not need forwarding.
976 gst_base_parse_sink_event_default (GstBaseParse * parse, GstEvent * event)
978 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
979 gboolean ret = FALSE;
980 gboolean forward_immediate = FALSE;
982 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
983 GST_EVENT_TYPE_NAME (event));
985 switch (GST_EVENT_TYPE (event)) {
990 gst_event_parse_caps (event, &caps);
991 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
993 if (klass->set_sink_caps)
994 ret = klass->set_sink_caps (parse, caps);
998 /* will send our own caps downstream */
999 gst_event_unref (event);
1003 case GST_EVENT_SEGMENT:
1005 const GstSegment *in_segment;
1006 GstSegment out_segment;
1007 gint64 offset = 0, next_dts;
1008 guint32 seqnum = gst_event_get_seqnum (event);
1010 gst_event_parse_segment (event, &in_segment);
1011 gst_segment_init (&out_segment, GST_FORMAT_TIME);
1013 GST_DEBUG_OBJECT (parse, "segment %" GST_SEGMENT_FORMAT, in_segment);
1015 parse->priv->upstream_format = in_segment->format;
1016 if (in_segment->format == GST_FORMAT_BYTES) {
1017 GstBaseParseSeek *seek = NULL;
1020 /* stop time is allowed to be open-ended, but not start & pos */
1021 offset = in_segment->time;
1023 GST_OBJECT_LOCK (parse);
1024 for (node = parse->priv->pending_seeks; node; node = node->next) {
1025 GstBaseParseSeek *tmp = node->data;
1027 if (tmp->offset == offset) {
1032 parse->priv->pending_seeks =
1033 g_slist_remove (parse->priv->pending_seeks, seek);
1034 GST_OBJECT_UNLOCK (parse);
1037 GST_DEBUG_OBJECT (parse,
1038 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
1039 seek->accurate ? " accurate" : "", &seek->segment);
1041 out_segment.start = seek->segment.start;
1042 out_segment.stop = seek->segment.stop;
1043 out_segment.time = seek->segment.start;
1045 next_dts = seek->start_ts;
1046 parse->priv->exact_position = seek->accurate;
1049 /* best attempt convert */
1050 /* as these are only estimates, stop is kept open-ended to avoid
1051 * premature cutting */
1052 gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
1053 GST_FORMAT_TIME, (gint64 *) & next_dts);
1055 out_segment.start = next_dts;
1056 out_segment.stop = GST_CLOCK_TIME_NONE;
1057 out_segment.time = next_dts;
1059 parse->priv->exact_position = (in_segment->start == 0);
1062 gst_event_unref (event);
1064 event = gst_event_new_segment (&out_segment);
1065 gst_event_set_seqnum (event, seqnum);
1067 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
1068 GST_SEGMENT_FORMAT, in_segment);
1070 } else if (in_segment->format != GST_FORMAT_TIME) {
1071 /* Unknown incoming segment format. Output a default open-ended
1073 gst_event_unref (event);
1075 out_segment.start = 0;
1076 out_segment.stop = GST_CLOCK_TIME_NONE;
1077 out_segment.time = 0;
1079 event = gst_event_new_segment (&out_segment);
1080 gst_event_set_seqnum (event, seqnum);
1084 /* not considered BYTE seekable if it is talking to us in TIME,
1085 * whatever else it might claim */
1086 parse->priv->upstream_seekable = FALSE;
1087 next_dts = in_segment->start;
1090 memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
1093 gst_segment_set_newsegment (&parse->segment, update, rate,
1094 applied_rate, format, start, stop, start);
1097 /* save the segment for later, right before we push a new buffer so that
1098 * the caps are fixed and the next linked element can receive
1100 parse->priv->pending_segment = TRUE;
1103 /* but finish the current segment */
1104 GST_DEBUG_OBJECT (parse, "draining current segment");
1105 if (in_segment->rate > 0.0)
1106 gst_base_parse_drain (parse);
1108 gst_base_parse_finish_fragment (parse, FALSE);
1109 gst_adapter_clear (parse->priv->adapter);
1111 parse->priv->offset = offset;
1112 parse->priv->sync_offset = offset;
1113 parse->priv->next_dts = next_dts;
1114 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
1115 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
1116 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
1117 parse->priv->prev_pts = GST_CLOCK_TIME_NONE;
1118 parse->priv->prev_dts = GST_CLOCK_TIME_NONE;
1119 parse->priv->discont = TRUE;
1120 parse->priv->seen_keyframe = FALSE;
1124 case GST_EVENT_FLUSH_START:
1125 GST_OBJECT_LOCK (parse);
1126 parse->priv->flushing = TRUE;
1127 GST_OBJECT_UNLOCK (parse);
1130 case GST_EVENT_FLUSH_STOP:
1131 gst_adapter_clear (parse->priv->adapter);
1132 gst_base_parse_clear_queues (parse);
1133 parse->priv->flushing = FALSE;
1134 parse->priv->discont = TRUE;
1135 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
1136 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
1137 parse->priv->new_frame = TRUE;
1139 forward_immediate = TRUE;
1143 if (parse->segment.rate > 0.0)
1144 gst_base_parse_drain (parse);
1146 gst_base_parse_finish_fragment (parse, TRUE);
1148 /* If we STILL have zero frames processed, fire an error */
1149 if (parse->priv->framecount == 0) {
1150 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1151 ("No valid frames found before end of stream"), (NULL));
1153 /* newsegment and other serialized events before eos */
1154 gst_base_parse_push_pending_events (parse);
1156 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1157 /* We've not posted bitrate tags yet - do so now */
1158 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
1160 forward_immediate = TRUE;
1162 case GST_EVENT_CUSTOM_DOWNSTREAM:{
1163 /* FIXME: Code duplicated from libgstvideo because core can't depend on -base */
1164 #ifndef GST_VIDEO_EVENT_STILL_STATE_NAME
1165 #define GST_VIDEO_EVENT_STILL_STATE_NAME "GstEventStillFrame"
1168 const GstStructure *s;
1169 gboolean ev_still_state;
1171 s = gst_event_get_structure (event);
1173 gst_structure_has_name (s, GST_VIDEO_EVENT_STILL_STATE_NAME) &&
1174 gst_structure_get_boolean (s, "still-state", &ev_still_state)) {
1175 if (ev_still_state) {
1176 GST_DEBUG_OBJECT (parse, "draining current data for still-frame");
1177 if (parse->segment.rate > 0.0)
1178 gst_base_parse_drain (parse);
1180 gst_base_parse_finish_fragment (parse, TRUE);
1182 forward_immediate = TRUE;
1188 GST_DEBUG_OBJECT (parse, "draining current data due to gap event");
1190 gst_base_parse_push_pending_events (parse);
1192 if (parse->segment.rate > 0.0)
1193 gst_base_parse_drain (parse);
1195 gst_base_parse_finish_fragment (parse, TRUE);
1196 forward_immediate = TRUE;
1200 /* See if any bitrate tags were posted */
1201 gst_base_parse_handle_tag (parse, event);
1204 case GST_EVENT_STREAM_START:
1205 if (parse->priv->pad_mode != GST_PAD_MODE_PULL)
1206 forward_immediate = TRUE;
1213 /* Forward non-serialized events and EOS/FLUSH_STOP immediately.
1214 * For EOS this is required because no buffer or serialized event
1215 * will come after EOS and nothing could trigger another
1216 * _finish_frame() call. *
1217 * If the subclass handles sending of EOS manually it can return
1218 * _DROPPED from ::finish() and all other subclasses should have
1219 * decoded/flushed all remaining data before this
1221 * For FLUSH_STOP this is required because it is expected
1222 * to be forwarded immediately and no buffers are queued anyway.
1225 if (!GST_EVENT_IS_SERIALIZED (event) || forward_immediate) {
1226 ret = gst_pad_push_event (parse->srcpad, event);
1228 // GST_VIDEO_DECODER_STREAM_LOCK (decoder);
1229 parse->priv->pending_events =
1230 g_list_prepend (parse->priv->pending_events, event);
1231 // GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
1236 GST_DEBUG_OBJECT (parse, "event handled");
1242 gst_base_parse_sink_query_default (GstBaseParse * parse, GstQuery * query)
1247 pad = GST_BASE_PARSE_SINK_PAD (parse);
1249 switch (GST_QUERY_TYPE (query)) {
1250 case GST_QUERY_CAPS:
1252 GstBaseParseClass *bclass;
1254 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1256 if (bclass->get_sink_caps) {
1257 GstCaps *caps, *filter;
1259 gst_query_parse_caps (query, &filter);
1260 caps = bclass->get_sink_caps (parse, filter);
1261 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
1263 gst_query_set_caps_result (query, caps);
1264 gst_caps_unref (caps);
1268 GstCaps *caps, *template_caps, *filter;
1270 gst_query_parse_caps (query, &filter);
1271 template_caps = gst_pad_get_pad_template_caps (pad);
1272 if (filter != NULL) {
1274 gst_caps_intersect_full (filter, template_caps,
1275 GST_CAPS_INTERSECT_FIRST);
1276 gst_caps_unref (template_caps);
1278 caps = template_caps;
1280 gst_query_set_caps_result (query, caps);
1281 gst_caps_unref (caps);
1289 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
1298 gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
1300 GstBaseParseClass *bclass;
1301 GstBaseParse *parse;
1304 parse = GST_BASE_PARSE (parent);
1305 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1307 GST_DEBUG_OBJECT (parse, "%s query", GST_QUERY_TYPE_NAME (query));
1309 if (bclass->sink_query)
1310 ret = bclass->sink_query (parse, query);
1314 GST_LOG_OBJECT (parse, "%s query result: %d %" GST_PTR_FORMAT,
1315 GST_QUERY_TYPE_NAME (query), ret, query);
1321 gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
1323 GstBaseParseClass *bclass;
1324 GstBaseParse *parse;
1327 parse = GST_BASE_PARSE (parent);
1328 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1330 GST_DEBUG_OBJECT (parse, "%s query: %" GST_PTR_FORMAT,
1331 GST_QUERY_TYPE_NAME (query), query);
1333 if (bclass->src_query)
1334 ret = bclass->src_query (parse, query);
1338 GST_LOG_OBJECT (parse, "%s query result: %d %" GST_PTR_FORMAT,
1339 GST_QUERY_TYPE_NAME (query), ret, query);
1344 /* gst_base_parse_src_event:
1345 * @pad: #GstPad that received the event.
1346 * @event: #GstEvent that was received.
1348 * Handler for source pad events.
1350 * Returns: TRUE if the event was handled.
1353 gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1355 GstBaseParse *parse;
1356 GstBaseParseClass *bclass;
1357 gboolean ret = TRUE;
1359 parse = GST_BASE_PARSE (parent);
1360 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1362 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1363 GST_EVENT_TYPE_NAME (event));
1365 if (bclass->src_event)
1366 ret = bclass->src_event (parse, event);
1368 gst_event_unref (event);
1374 gst_base_parse_is_seekable (GstBaseParse * parse)
1376 /* FIXME: could do more here, e.g. check index or just send data from 0
1377 * in pull mode and let decoder/sink clip */
1378 return parse->priv->syncable;
1381 /* gst_base_parse_src_event_default:
1382 * @parse: #GstBaseParse.
1383 * @event: #GstEvent that was received.
1385 * Default srcpad event handler.
1387 * Returns: TRUE if the event was handled and can be dropped.
1390 gst_base_parse_src_event_default (GstBaseParse * parse, GstEvent * event)
1392 gboolean res = FALSE;
1394 switch (GST_EVENT_TYPE (event)) {
1395 case GST_EVENT_SEEK:
1396 if (gst_base_parse_is_seekable (parse))
1397 res = gst_base_parse_handle_seek (parse, event);
1400 res = gst_pad_event_default (parse->srcpad, GST_OBJECT_CAST (parse),
1409 * gst_base_parse_convert_default:
1410 * @parse: #GstBaseParse.
1411 * @src_format: #GstFormat describing the source format.
1412 * @src_value: Source value to be converted.
1413 * @dest_format: #GstFormat defining the converted format.
1414 * @dest_value: Pointer where the conversion result will be put.
1416 * Default implementation of "convert" vmethod in #GstBaseParse class.
1418 * Returns: TRUE if conversion was successful.
1421 gst_base_parse_convert_default (GstBaseParse * parse,
1422 GstFormat src_format,
1423 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1425 gboolean ret = FALSE;
1426 guint64 bytes, duration;
1428 if (G_UNLIKELY (src_format == dest_format)) {
1429 *dest_value = src_value;
1433 if (G_UNLIKELY (src_value == -1)) {
1438 if (G_UNLIKELY (src_value == 0)) {
1443 /* need at least some frames */
1444 if (!parse->priv->framecount)
1447 duration = parse->priv->acc_duration / GST_MSECOND;
1448 bytes = parse->priv->bytecount;
1450 if (G_UNLIKELY (!duration || !bytes))
1451 goto no_duration_bytes;
1453 if (src_format == GST_FORMAT_BYTES) {
1454 if (dest_format == GST_FORMAT_TIME) {
1455 /* BYTES -> TIME conversion */
1456 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1457 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1458 *dest_value *= GST_MSECOND;
1459 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1460 *dest_value / GST_MSECOND);
1463 GST_DEBUG_OBJECT (parse, "converting bytes -> other not implemented");
1465 } else if (src_format == GST_FORMAT_TIME) {
1466 if (dest_format == GST_FORMAT_BYTES) {
1467 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1468 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1470 GST_DEBUG_OBJECT (parse,
1471 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1472 src_value / GST_MSECOND, *dest_value);
1475 GST_DEBUG_OBJECT (parse, "converting time -> other not implemented");
1477 } else if (src_format == GST_FORMAT_DEFAULT) {
1478 /* DEFAULT == frame-based */
1479 if (dest_format == GST_FORMAT_TIME) {
1480 GST_DEBUG_OBJECT (parse, "converting default -> time");
1481 if (parse->priv->fps_den) {
1482 *dest_value = gst_util_uint64_scale (src_value,
1483 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1487 GST_DEBUG_OBJECT (parse, "converting default -> other not implemented");
1490 GST_DEBUG_OBJECT (parse, "conversion not implemented");
1497 GST_DEBUG_OBJECT (parse, "no framecount");
1502 GST_DEBUG_OBJECT (parse, "no duration %" G_GUINT64_FORMAT ", bytes %"
1503 G_GUINT64_FORMAT, duration, bytes);
1510 gst_base_parse_update_duration (GstBaseParse * baseparse)
1513 GstBaseParse *parse;
1515 parse = GST_BASE_PARSE (baseparse);
1517 peer = gst_pad_get_peer (parse->sinkpad);
1519 gboolean qres = FALSE;
1520 gint64 ptot, dest_value;
1522 qres = gst_pad_query_duration (peer, GST_FORMAT_BYTES, &ptot);
1523 gst_object_unref (GST_OBJECT (peer));
1525 if (gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
1526 GST_FORMAT_TIME, &dest_value)) {
1528 /* inform if duration changed, but try to avoid spamming */
1529 parse->priv->estimated_drift +=
1530 dest_value - parse->priv->estimated_duration;
1531 if (parse->priv->estimated_drift > GST_SECOND ||
1532 parse->priv->estimated_drift < -GST_SECOND) {
1533 gst_element_post_message (GST_ELEMENT (parse),
1534 gst_message_new_duration_changed (GST_OBJECT (parse)));
1535 parse->priv->estimated_drift = 0;
1537 parse->priv->estimated_duration = dest_value;
1538 GST_LOG_OBJECT (parse,
1539 "updated estimated duration to %" GST_TIME_FORMAT,
1540 GST_TIME_ARGS (dest_value));
1547 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1548 gboolean post_avg, gboolean post_max)
1550 GstTagList *taglist = NULL;
1552 if (post_min && parse->priv->post_min_bitrate) {
1553 taglist = gst_tag_list_new_empty ();
1555 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1556 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1559 if (post_avg && parse->priv->post_avg_bitrate) {
1560 if (taglist == NULL)
1561 taglist = gst_tag_list_new_empty ();
1563 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1564 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1565 parse->priv->avg_bitrate, NULL);
1568 if (post_max && parse->priv->post_max_bitrate) {
1569 if (taglist == NULL)
1570 taglist = gst_tag_list_new_empty ();
1572 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1573 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1576 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1577 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1578 parse->priv->max_bitrate);
1580 if (taglist != NULL) {
1581 gst_pad_push_event (parse->srcpad, gst_event_new_tag (taglist));
1585 /* gst_base_parse_update_bitrates:
1586 * @parse: #GstBaseParse.
1587 * @buffer: Current frame as a #GstBuffer
1589 * Keeps track of the minimum and maximum bitrates, and also maintains a
1590 * running average bitrate of the stream so far.
1593 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1595 /* Only update the tag on a 10 kbps delta */
1596 static const gint update_threshold = 10000;
1598 guint64 data_len, frame_dur;
1599 gint overhead, frame_bitrate, old_avg_bitrate;
1600 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1601 GstBuffer *buffer = frame->buffer;
1603 overhead = frame->overhead;
1607 data_len = gst_buffer_get_size (buffer) - overhead;
1608 parse->priv->data_bytecount += data_len;
1610 /* duration should be valid by now,
1611 * either set by subclass or maybe based on fps settings */
1612 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1613 /* Calculate duration of a frame from buffer properties */
1614 frame_dur = GST_BUFFER_DURATION (buffer);
1615 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1616 parse->priv->acc_duration;
1619 /* No way to figure out frame duration (is this even possible?) */
1623 /* override if subclass provided bitrate, e.g. metadata based */
1624 if (parse->priv->bitrate) {
1625 parse->priv->avg_bitrate = parse->priv->bitrate;
1626 /* spread this (confirmed) info ASAP */
1627 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1628 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1632 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1636 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1637 parse->priv->avg_bitrate);
1639 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1641 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1642 /* always post all at threshold time */
1643 update_min = update_max = update_avg = TRUE;
1646 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1647 if (frame_bitrate < parse->priv->min_bitrate) {
1648 parse->priv->min_bitrate = frame_bitrate;
1652 if (frame_bitrate > parse->priv->max_bitrate) {
1653 parse->priv->max_bitrate = frame_bitrate;
1657 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1658 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1659 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1664 if ((update_min || update_avg || update_max))
1665 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1672 * gst_base_parse_add_index_entry:
1673 * @parse: #GstBaseParse.
1674 * @offset: offset of entry
1675 * @ts: timestamp associated with offset
1676 * @key: whether entry refers to keyframe
1677 * @force: add entry disregarding sanity checks
1679 * Adds an entry to the index associating @offset to @ts. It is recommended
1680 * to only add keyframe entries. @force allows to bypass checks, such as
1681 * whether the stream is (upstream) seekable, another entry is already "close"
1682 * to the new entry, etc.
1684 * Returns: #gboolean indicating whether entry was added
1687 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1688 GstClockTime ts, gboolean key, gboolean force)
1690 gboolean ret = FALSE;
1691 GstIndexAssociation associations[2];
1693 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1694 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1696 if (G_LIKELY (!force)) {
1698 if (!parse->priv->upstream_seekable) {
1699 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1703 /* FIXME need better helper data structure that handles these issues
1704 * related to ongoing collecting of index entries */
1705 if (parse->priv->index_last_offset + parse->priv->idx_byte_interval >=
1707 GST_LOG_OBJECT (parse,
1708 "already have entries up to offset 0x%08" G_GINT64_MODIFIER "x",
1709 parse->priv->index_last_offset + parse->priv->idx_byte_interval);
1713 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1714 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1715 parse->priv->idx_interval) {
1716 GST_LOG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1717 GST_TIME_ARGS (parse->priv->index_last_ts));
1721 /* if last is not really the last one */
1722 if (!parse->priv->index_last_valid) {
1723 GstClockTime prev_ts;
1725 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1726 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1727 GST_LOG_OBJECT (parse,
1728 "entry too close to existing entry %" GST_TIME_FORMAT,
1729 GST_TIME_ARGS (prev_ts));
1730 parse->priv->index_last_offset = offset;
1731 parse->priv->index_last_ts = ts;
1737 associations[0].format = GST_FORMAT_TIME;
1738 associations[0].value = ts;
1739 associations[1].format = GST_FORMAT_BYTES;
1740 associations[1].value = offset;
1742 /* index might change on-the-fly, although that would be nutty app ... */
1743 GST_BASE_PARSE_INDEX_LOCK (parse);
1744 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1745 (key) ? GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT :
1746 GST_INDEX_ASSOCIATION_FLAG_DELTA_UNIT, 2,
1747 (const GstIndexAssociation *) &associations);
1748 GST_BASE_PARSE_INDEX_UNLOCK (parse);
1751 parse->priv->index_last_offset = offset;
1752 parse->priv->index_last_ts = ts;
1761 /* check for seekable upstream, above and beyond a mere query */
1763 gst_base_parse_check_seekability (GstBaseParse * parse)
1766 gboolean seekable = FALSE;
1767 gint64 start = -1, stop = -1;
1768 guint idx_interval = 0;
1769 guint64 idx_byte_interval = 0;
1771 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1772 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1773 GST_DEBUG_OBJECT (parse, "seeking query failed");
1777 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1779 /* try harder to query upstream size if we didn't get it the first time */
1780 if (seekable && stop == -1) {
1781 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1782 gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
1785 /* if upstream doesn't know the size, it's likely that it's not seekable in
1786 * practice even if it technically may be seekable */
1787 if (seekable && (start != 0 || stop <= start)) {
1788 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1792 /* let's not put every single frame into our index */
1794 if (stop < 10 * 1024 * 1024)
1796 else if (stop < 100 * 1024 * 1024)
1799 idx_interval = 1000;
1801 /* ensure that even for large files (e.g. very long audio files), the index
1802 * stays reasonably-size, with some arbitrary limit to the total number of
1804 idx_byte_interval = (stop - start) / MAX_INDEX_ENTRIES;
1805 GST_DEBUG_OBJECT (parse,
1806 "Limiting index entries to %d, indexing byte interval %"
1807 G_GUINT64_FORMAT " bytes", MAX_INDEX_ENTRIES, idx_byte_interval);
1811 gst_query_unref (query);
1813 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1814 G_GUINT64_FORMAT ")", seekable, start, stop);
1815 parse->priv->upstream_seekable = seekable;
1816 parse->priv->upstream_size = seekable ? stop : 0;
1818 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1819 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1820 parse->priv->idx_byte_interval = idx_byte_interval;
1823 /* some misc checks on upstream */
1825 gst_base_parse_check_upstream (GstBaseParse * parse)
1829 if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
1830 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1831 /* upstream has one, accept it also, and no further updates */
1832 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1833 parse->priv->upstream_has_duration = TRUE;
1836 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1837 parse->priv->upstream_has_duration);
1840 /* checks src caps to determine if dealing with audio or video */
1841 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1843 gst_base_parse_check_media (GstBaseParse * parse)
1848 caps = gst_pad_get_current_caps (parse->srcpad);
1849 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1850 parse->priv->is_video =
1851 g_str_has_prefix (gst_structure_get_name (s), "video");
1853 /* historical default */
1854 parse->priv->is_video = FALSE;
1857 gst_caps_unref (caps);
1859 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1862 /* takes ownership of frame */
1864 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1866 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1867 /* frame allocated on the heap, we can just take ownership */
1868 g_queue_push_tail (&parse->priv->queued_frames, frame);
1869 GST_TRACE ("queued frame %p", frame);
1871 GstBaseParseFrame *copy;
1873 /* probably allocated on the stack, must make a proper copy */
1874 copy = gst_base_parse_frame_copy (frame);
1875 g_queue_push_tail (&parse->priv->queued_frames, copy);
1876 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1877 gst_base_parse_frame_free (frame);
1881 /* makes sure that @buf is properly prepared and decorated for passing
1882 * to baseclass, and an equally setup frame is returned setup with @buf.
1883 * Takes ownership of @buf. */
1884 static GstBaseParseFrame *
1885 gst_base_parse_prepare_frame (GstBaseParse * parse, GstBuffer * buffer)
1887 GstBaseParseFrame *frame = NULL;
1889 buffer = gst_buffer_make_writable (buffer);
1891 GST_LOG_OBJECT (parse,
1892 "preparing frame at offset %" G_GUINT64_FORMAT
1893 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
1894 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1895 gst_buffer_get_size (buffer));
1897 if (parse->priv->discont) {
1898 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1899 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1900 parse->priv->discont = FALSE;
1903 GST_BUFFER_OFFSET (buffer) = parse->priv->offset;
1905 frame = gst_base_parse_frame_new (buffer, 0, 0);
1907 /* also ensure to update state flags */
1908 gst_base_parse_frame_update (parse, frame, buffer);
1909 gst_buffer_unref (buffer);
1911 if (parse->priv->prev_offset != parse->priv->offset || parse->priv->new_frame) {
1912 GST_LOG_OBJECT (parse, "marking as new frame");
1913 parse->priv->new_frame = FALSE;
1914 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_NEW_FRAME;
1917 frame->offset = parse->priv->prev_offset = parse->priv->offset;
1919 /* use default handler to provide initial (upstream) metadata */
1920 gst_base_parse_parse_frame (parse, frame);
1925 /* Wraps buffer in a frame and dispatches to subclass.
1926 * Also manages data skipping and offset handling (including adapter flushing).
1927 * Takes ownership of @buffer */
1928 static GstFlowReturn
1929 gst_base_parse_handle_buffer (GstBaseParse * parse, GstBuffer * buffer,
1930 gint * skip, gint * flushed)
1932 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1933 GstBaseParseFrame *frame;
1936 g_return_val_if_fail (skip != NULL || flushed != NULL, GST_FLOW_ERROR);
1938 GST_LOG_OBJECT (parse,
1939 "handling buffer of size %" G_GSIZE_FORMAT " with dts %" GST_TIME_FORMAT
1940 ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
1941 gst_buffer_get_size (buffer), GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
1942 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
1943 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1945 /* track what is being flushed during this single round of frame processing */
1946 parse->priv->flushed = 0;
1949 /* make it easy for _finish_frame to pick up input data */
1950 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1951 gst_buffer_ref (buffer);
1952 gst_adapter_push (parse->priv->adapter, buffer);
1955 frame = gst_base_parse_prepare_frame (parse, buffer);
1956 ret = klass->handle_frame (parse, frame, skip);
1958 *flushed = parse->priv->flushed;
1960 GST_LOG_OBJECT (parse, "handle_frame skipped %d, flushed %d",
1963 /* subclass can only do one of these, or semantics are too unclear */
1964 g_assert (*skip == 0 || *flushed == 0);
1966 /* track skipping */
1968 GstClockTime pts, dts;
1971 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", *skip);
1972 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
1973 /* reverse playback, and no frames found yet, so we are skipping
1974 * the leading part of a fragment, which may form the tail of
1975 * fragment coming later, hopefully subclass skips efficiently ... */
1976 pts = gst_adapter_prev_pts (parse->priv->adapter, NULL);
1977 dts = gst_adapter_prev_dts (parse->priv->adapter, NULL);
1978 outbuf = gst_adapter_take_buffer (parse->priv->adapter, *skip);
1979 outbuf = gst_buffer_make_writable (outbuf);
1980 GST_BUFFER_PTS (outbuf) = pts;
1981 GST_BUFFER_DTS (outbuf) = dts;
1982 parse->priv->buffers_head =
1983 g_slist_prepend (parse->priv->buffers_head, outbuf);
1986 gst_adapter_flush (parse->priv->adapter, *skip);
1988 if (!parse->priv->discont)
1989 parse->priv->sync_offset = parse->priv->offset;
1990 parse->priv->offset += *skip;
1991 parse->priv->discont = TRUE;
1992 /* check for indefinite skipping */
1993 if (ret == GST_FLOW_OK)
1994 ret = gst_base_parse_check_sync (parse);
1997 parse->priv->offset += *flushed;
1999 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
2000 gst_adapter_clear (parse->priv->adapter);
2003 gst_base_parse_frame_free (frame);
2008 /* gst_base_parse_push_pending_events:
2009 * @parse: #GstBaseParse
2011 * Pushes the pending events
2014 gst_base_parse_push_pending_events (GstBaseParse * parse)
2016 if (G_UNLIKELY (parse->priv->pending_events)) {
2017 GList *r = g_list_reverse (parse->priv->pending_events);
2020 parse->priv->pending_events = NULL;
2021 for (l = r; l != NULL; l = l->next) {
2022 gst_pad_push_event (parse->srcpad, GST_EVENT_CAST (l->data));
2025 parse->priv->pending_segment = FALSE;
2029 /* gst_base_parse_handle_and_push_frame:
2030 * @parse: #GstBaseParse.
2031 * @klass: #GstBaseParseClass.
2032 * @frame: (transfer full): a #GstBaseParseFrame
2034 * Parses the frame from given buffer and pushes it forward. Also performs
2035 * timestamp handling and checks the segment limits.
2037 * This is called with srcpad STREAM_LOCK held.
2039 * Returns: #GstFlowReturn
2041 static GstFlowReturn
2042 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
2043 GstBaseParseFrame * frame)
2048 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2050 buffer = frame->buffer;
2051 offset = frame->offset;
2053 /* check if subclass/format can provide ts.
2054 * If so, that allows and enables extra seek and duration determining options */
2055 if (G_UNLIKELY (parse->priv->first_frame_offset < 0)) {
2056 if (GST_BUFFER_PTS_IS_VALID (buffer) && parse->priv->has_timing_info
2057 && parse->priv->pad_mode == GST_PAD_MODE_PULL) {
2058 parse->priv->first_frame_offset = offset;
2059 parse->priv->first_frame_pts = GST_BUFFER_PTS (buffer);
2060 parse->priv->first_frame_dts = GST_BUFFER_DTS (buffer);
2061 GST_DEBUG_OBJECT (parse, "subclass provided dts %" GST_TIME_FORMAT
2062 ", pts %" GST_TIME_FORMAT " for first frame at offset %"
2063 G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->first_frame_dts),
2064 GST_TIME_ARGS (parse->priv->first_frame_pts),
2065 parse->priv->first_frame_offset);
2066 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
2068 GstClockTime last_ts = G_MAXINT64;
2070 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
2071 gst_base_parse_locate_time (parse, &last_ts, &off);
2072 if (GST_CLOCK_TIME_IS_VALID (last_ts))
2073 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
2076 /* disable further checks */
2077 parse->priv->first_frame_offset = 0;
2081 /* track upstream time if provided, not subclass' internal notion of it */
2082 if (parse->priv->upstream_format == GST_FORMAT_TIME) {
2083 GST_BUFFER_PTS (frame->buffer) = GST_CLOCK_TIME_NONE;
2084 GST_BUFFER_DTS (frame->buffer) = GST_CLOCK_TIME_NONE;
2087 /* interpolating and no valid pts yet,
2088 * start with dts and carry on from there */
2089 if (parse->priv->infer_ts && parse->priv->pts_interpolate
2090 && !GST_CLOCK_TIME_IS_VALID (parse->priv->next_pts))
2091 parse->priv->next_pts = parse->priv->next_dts;
2093 /* again use default handler to add missing metadata;
2094 * we may have new information on frame properties */
2095 gst_base_parse_parse_frame (parse, frame);
2097 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
2098 if (GST_BUFFER_DTS_IS_VALID (buffer) && GST_BUFFER_DURATION_IS_VALID (buffer)) {
2099 parse->priv->next_dts =
2100 GST_BUFFER_DTS (buffer) + GST_BUFFER_DURATION (buffer);
2101 if (parse->priv->pts_interpolate && GST_BUFFER_PTS_IS_VALID (buffer)) {
2102 GstClockTime next_pts =
2103 GST_BUFFER_PTS (buffer) + GST_BUFFER_DURATION (buffer);
2104 if (next_pts >= parse->priv->next_dts)
2105 parse->priv->next_pts = next_pts;
2108 /* we lost track, do not produce bogus time next time around
2109 * (probably means parser subclass has given up on parsing as well) */
2110 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
2111 parse->priv->next_dts = GST_CLOCK_TIME_NONE;
2114 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
2115 GST_BUFFER_PTS_IS_VALID (buffer))
2116 gst_base_parse_add_index_entry (parse, offset,
2117 GST_BUFFER_PTS (buffer),
2118 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
2120 /* All OK, push queued frames if there are any */
2121 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
2122 GstBaseParseFrame *queued_frame;
2124 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
2125 gst_base_parse_push_frame (parse, queued_frame);
2129 return gst_base_parse_push_frame (parse, frame);
2133 * gst_base_parse_push_frame:
2134 * @parse: #GstBaseParse.
2135 * @frame: (transfer none): a #GstBaseParseFrame
2137 * Pushes the frame's buffer downstream, sends any pending events and
2138 * does some timestamp and segment handling. Takes ownership of
2139 * frame's buffer, though caller retains ownership of @frame.
2141 * This must be called with sinkpad STREAM_LOCK held.
2143 * Returns: #GstFlowReturn
2146 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
2148 GstFlowReturn ret = GST_FLOW_OK;
2149 GstClockTime last_start = GST_CLOCK_TIME_NONE;
2150 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
2151 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
2155 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2156 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
2158 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
2160 buffer = frame->buffer;
2162 GST_LOG_OBJECT (parse,
2163 "processing buffer of size %" G_GSIZE_FORMAT " with dts %" GST_TIME_FORMAT
2164 ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
2165 gst_buffer_get_size (buffer),
2166 GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
2167 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
2168 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
2171 parse->priv->bytecount += frame->size;
2172 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
2173 parse->priv->framecount++;
2174 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
2175 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
2178 /* 0 means disabled */
2179 if (parse->priv->update_interval < 0)
2180 parse->priv->update_interval = 50;
2181 else if (parse->priv->update_interval > 0 &&
2182 (parse->priv->framecount % parse->priv->update_interval) == 0)
2183 gst_base_parse_update_duration (parse);
2185 if (GST_BUFFER_PTS_IS_VALID (buffer))
2186 last_start = last_stop = GST_BUFFER_PTS (buffer);
2187 if (last_start != GST_CLOCK_TIME_NONE
2188 && GST_BUFFER_DURATION_IS_VALID (buffer))
2189 last_stop = last_start + GST_BUFFER_DURATION (buffer);
2191 /* should have caps by now */
2192 if (!gst_pad_has_current_caps (parse->srcpad))
2195 if (G_UNLIKELY (parse->priv->pending_segment)) {
2196 /* have caps; check identity */
2197 gst_base_parse_check_media (parse);
2200 /* Push pending events, including SEGMENT events */
2201 gst_base_parse_push_pending_events (parse);
2203 /* segment adjustment magic; only if we are running the whole show */
2204 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
2205 (parse->priv->pad_mode == GST_PAD_MODE_PULL ||
2206 parse->priv->upstream_seekable)) {
2208 if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
2209 GST_CLOCK_TIME_IS_VALID (last_start)) {
2210 GstClockTimeDiff diff;
2212 /* only send newsegments with increasing start times,
2213 * otherwise if these go back and forth downstream (sinks) increase
2214 * accumulated time and running_time */
2215 diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
2216 if (G_UNLIKELY (diff > 2 * GST_SECOND
2217 && last_start > parse->segment.start
2218 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
2219 || last_start < parse->segment.stop))) {
2221 GST_DEBUG_OBJECT (parse,
2222 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
2223 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
2224 "Sending updated SEGMENT events", diff,
2225 GST_TIME_ARGS (parse->segment.position),
2226 GST_TIME_ARGS (last_start));
2228 /* skip gap FIXME */
2229 gst_pad_push_event (parse->srcpad,
2230 gst_event_new_segment (&parse->segment));
2232 parse->segment.position = last_start;
2237 /* update bitrates and optionally post corresponding tags
2238 * (following newsegment) */
2239 gst_base_parse_update_bitrates (parse, frame);
2241 if (klass->pre_push_frame) {
2242 ret = klass->pre_push_frame (parse, frame);
2244 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
2247 /* take final ownership of frame buffer */
2248 if (frame->out_buffer) {
2249 buffer = frame->out_buffer;
2250 frame->out_buffer = NULL;
2251 gst_buffer_replace (&frame->buffer, NULL);
2253 buffer = frame->buffer;
2254 frame->buffer = NULL;
2257 /* subclass must play nice */
2258 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2260 size = gst_buffer_get_size (buffer);
2262 parse->priv->seen_keyframe |= parse->priv->is_video &&
2263 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
2265 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
2266 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2267 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
2268 GST_BUFFER_TIMESTAMP (buffer) >
2269 parse->segment.stop + parse->priv->lead_out_ts) {
2270 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
2272 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2273 GST_BUFFER_DURATION_IS_VALID (buffer) &&
2274 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
2275 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
2276 parse->priv->lead_in_ts < parse->segment.start) {
2277 if (parse->priv->seen_keyframe) {
2278 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
2281 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
2282 ret = GST_BASE_PARSE_FLOW_DROPPED;
2289 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
2290 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
2291 gst_buffer_unref (buffer);
2293 } else if (ret == GST_FLOW_OK) {
2294 if (parse->segment.rate > 0.0) {
2295 GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
2297 ret = gst_pad_push (parse->srcpad, buffer);
2298 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
2300 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
2302 parse->priv->buffers_queued =
2303 g_slist_prepend (parse->priv->buffers_queued, buffer);
2307 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
2308 size, gst_flow_get_name (ret));
2309 gst_buffer_unref (buffer);
2310 /* if we are not sufficiently in control, let upstream decide on EOS */
2311 if (ret == GST_FLOW_EOS && !parse->priv->disable_passthrough &&
2312 (parse->priv->passthrough ||
2313 (parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
2314 !parse->priv->upstream_seekable)))
2318 /* Update current running segment position */
2319 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
2320 parse->segment.position < last_stop)
2321 parse->segment.position = last_stop;
2328 GST_ELEMENT_ERROR (parse, STREAM, DECODE, ("No caps set"), (NULL));
2329 return GST_FLOW_ERROR;
2334 * gst_base_parse_finish_frame:
2335 * @parse: a #GstBaseParse
2336 * @frame: a #GstBaseParseFrame
2337 * @size: consumed input data represented by frame
2339 * Collects parsed data and pushes this downstream.
2340 * Source pad caps must be set when this is called.
2342 * If @frame's out_buffer is set, that will be used as subsequent frame data.
2343 * Otherwise, @size samples will be taken from the input and used for output,
2344 * and the output's metadata (timestamps etc) will be taken as (optionally)
2345 * set by the subclass on @frame's (input) buffer (which is otherwise
2346 * ignored for any but the above purpose/information).
2348 * Note that the latter buffer is invalidated by this call, whereas the
2349 * caller retains ownership of @frame.
2351 * Returns: a #GstFlowReturn that should be escalated to caller (of caller)
2354 gst_base_parse_finish_frame (GstBaseParse * parse, GstBaseParseFrame * frame,
2357 GstFlowReturn ret = GST_FLOW_OK;
2359 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2360 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
2361 g_return_val_if_fail (size > 0 || frame->out_buffer, GST_FLOW_ERROR);
2362 g_return_val_if_fail (gst_adapter_available (parse->priv->adapter) >= size,
2365 GST_LOG_OBJECT (parse, "finished frame at offset %" G_GUINT64_FORMAT ", "
2366 "flushing size %d", frame->offset, size);
2368 /* some one-time start-up */
2369 if (G_UNLIKELY (parse->priv->framecount == 0)) {
2370 gst_base_parse_check_seekability (parse);
2371 gst_base_parse_check_upstream (parse);
2374 parse->priv->flushed += size;
2376 if (parse->priv->scanning && frame->buffer) {
2377 if (!parse->priv->scanned_frame) {
2378 parse->priv->scanned_frame = gst_base_parse_frame_copy (frame);
2383 /* either PUSH or PULL mode arranges for adapter data */
2384 /* ensure output buffer */
2385 if (!frame->out_buffer) {
2386 GstBuffer *src, *dest;
2388 frame->out_buffer = gst_adapter_take_buffer (parse->priv->adapter, size);
2389 dest = frame->out_buffer;
2390 src = frame->buffer;
2391 GST_BUFFER_PTS (dest) = GST_BUFFER_PTS (src);
2392 GST_BUFFER_DTS (dest) = GST_BUFFER_DTS (src);
2393 GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET (src);
2394 GST_BUFFER_DURATION (dest) = GST_BUFFER_DURATION (src);
2395 GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_END (src);
2396 GST_MINI_OBJECT_FLAGS (dest) = GST_MINI_OBJECT_FLAGS (src);
2398 gst_adapter_flush (parse->priv->adapter, size);
2401 /* use as input for subsequent processing */
2402 gst_buffer_replace (&frame->buffer, frame->out_buffer);
2403 gst_buffer_unref (frame->out_buffer);
2404 frame->out_buffer = NULL;
2406 /* mark input size consumed */
2409 /* subclass might queue frames/data internally if it needs more
2410 * frames to decide on the format, or might request us to queue here. */
2411 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_DROP) {
2412 gst_buffer_replace (&frame->buffer, NULL);
2414 } else if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_QUEUE) {
2415 GstBaseParseFrame *copy;
2417 copy = gst_base_parse_frame_copy (frame);
2418 copy->flags &= ~GST_BASE_PARSE_FRAME_FLAG_QUEUE;
2419 gst_base_parse_queue_frame (parse, copy);
2423 ret = gst_base_parse_handle_and_push_frame (parse, frame);
2429 /* gst_base_parse_drain:
2431 * Drains the adapter until it is empty. It decreases the min_frame_size to
2432 * match the current adapter size and calls chain method until the adapter
2433 * is emptied or chain returns with error.
2436 gst_base_parse_drain (GstBaseParse * parse)
2440 GST_DEBUG_OBJECT (parse, "draining");
2441 parse->priv->drain = TRUE;
2444 avail = gst_adapter_available (parse->priv->adapter);
2448 if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
2449 NULL) != GST_FLOW_OK) {
2453 /* nothing changed, maybe due to truncated frame; break infinite loop */
2454 if (avail == gst_adapter_available (parse->priv->adapter)) {
2455 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2456 gst_adapter_clear (parse->priv->adapter);
2460 parse->priv->drain = FALSE;
2463 /* gst_base_parse_send_buffers
2465 * Sends buffers collected in send_buffers downstream, and ensures that list
2466 * is empty at the end (errors or not).
2468 static GstFlowReturn
2469 gst_base_parse_send_buffers (GstBaseParse * parse)
2471 GSList *send = NULL;
2473 GstFlowReturn ret = GST_FLOW_OK;
2475 send = parse->priv->buffers_send;
2479 buf = GST_BUFFER_CAST (send->data);
2480 GST_LOG_OBJECT (parse, "pushing buffer %p, dts %"
2481 GST_TIME_FORMAT ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2482 ", offset %" G_GINT64_FORMAT, buf,
2483 GST_TIME_ARGS (GST_BUFFER_DTS (buf)),
2484 GST_TIME_ARGS (GST_BUFFER_PTS (buf)),
2485 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2487 /* iterate output queue an push downstream */
2488 ret = gst_pad_push (parse->srcpad, buf);
2489 send = g_slist_delete_link (send, send);
2491 /* clear any leftover if error */
2492 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2494 buf = GST_BUFFER_CAST (send->data);
2495 gst_buffer_unref (buf);
2496 send = g_slist_delete_link (send, send);
2501 parse->priv->buffers_send = send;
2506 /* gst_base_parse_start_fragment:
2508 * Prepares for processing a reverse playback (forward) fragment
2509 * by (re)setting proper state variables.
2511 static GstFlowReturn
2512 gst_base_parse_start_fragment (GstBaseParse * parse)
2514 GST_LOG_OBJECT (parse, "starting fragment");
2516 /* invalidate so no fall-back timestamping is performed;
2517 * ok if taken from subclass or upstream */
2518 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
2519 parse->priv->prev_pts = GST_CLOCK_TIME_NONE;
2520 parse->priv->next_dts = GST_CLOCK_TIME_NONE;
2521 parse->priv->prev_dts = GST_CLOCK_TIME_NONE;
2522 /* prevent it hanging around stop all the time */
2523 parse->segment.position = GST_CLOCK_TIME_NONE;
2525 parse->priv->discont = TRUE;
2527 /* head of previous fragment is now pending tail of current fragment */
2528 parse->priv->buffers_pending = parse->priv->buffers_head;
2529 parse->priv->buffers_head = NULL;
2535 /* gst_base_parse_finish_fragment:
2537 * Processes a reverse playback (forward) fragment:
2538 * - append head of last fragment that was skipped to current fragment data
2539 * - drain the resulting current fragment data (i.e. repeated chain)
2540 * - add time/duration (if needed) to frames queued by chain
2541 * - push queued data
2543 static GstFlowReturn
2544 gst_base_parse_finish_fragment (GstBaseParse * parse, gboolean prev_head)
2547 GstFlowReturn ret = GST_FLOW_OK;
2548 gboolean seen_key = FALSE, seen_delta = FALSE;
2550 GST_LOG_OBJECT (parse, "finishing fragment");
2553 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2554 while (parse->priv->buffers_pending) {
2555 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2557 GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
2558 gst_buffer_get_size (buf));
2559 gst_adapter_push (parse->priv->adapter, buf);
2561 GST_LOG_OBJECT (parse, "discarding head buffer");
2562 gst_buffer_unref (buf);
2564 parse->priv->buffers_pending =
2565 g_slist_delete_link (parse->priv->buffers_pending,
2566 parse->priv->buffers_pending);
2569 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2570 /* initial skipped data is added to buffers_pending */
2571 gst_base_parse_drain (parse);
2573 if (parse->priv->buffers_send) {
2574 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2575 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2578 /* add metadata (if needed to queued buffers */
2579 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2580 GST_TIME_ARGS (parse->priv->last_pts));
2581 while (parse->priv->buffers_queued) {
2582 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2584 /* no touching if upstream or parsing provided time */
2585 if (GST_BUFFER_PTS_IS_VALID (buf)) {
2586 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2587 GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
2588 } else if (GST_BUFFER_DURATION_IS_VALID (buf)) {
2589 if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_pts)) {
2590 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_pts))
2591 parse->priv->last_pts -= GST_BUFFER_DURATION (buf);
2593 parse->priv->last_pts = 0;
2594 GST_BUFFER_PTS (buf) = parse->priv->last_pts;
2595 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2596 GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
2598 if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_dts)) {
2599 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_dts))
2600 parse->priv->last_dts -= GST_BUFFER_DURATION (buf);
2602 parse->priv->last_dts = 0;
2603 GST_BUFFER_DTS (buf) = parse->priv->last_dts;
2604 GST_LOG_OBJECT (parse, "applied dts %" GST_TIME_FORMAT,
2605 GST_TIME_ARGS (GST_BUFFER_DTS (buf)));
2608 /* no idea, very bad */
2609 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2612 parse->priv->last_pts = GST_BUFFER_PTS (buf);
2613 parse->priv->last_dts = GST_BUFFER_DTS (buf);
2615 /* reverse order for ascending sending */
2616 /* send downstream at keyframe not preceded by a keyframe
2617 * (e.g. that should identify start of collection of IDR nals) */
2618 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2620 ret = gst_base_parse_send_buffers (parse);
2621 /* if a problem, throw all to sending */
2622 if (ret != GST_FLOW_OK) {
2623 parse->priv->buffers_send =
2624 g_slist_reverse (parse->priv->buffers_queued);
2625 parse->priv->buffers_queued = NULL;
2635 parse->priv->buffers_send =
2636 g_slist_prepend (parse->priv->buffers_send, buf);
2637 parse->priv->buffers_queued =
2638 g_slist_delete_link (parse->priv->buffers_queued,
2639 parse->priv->buffers_queued);
2642 /* audio may have all marked as keyframe, so arrange to send here */
2644 ret = gst_base_parse_send_buffers (parse);
2646 /* any trailing unused no longer usable (ideally none) */
2647 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2648 GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
2649 gst_adapter_available (parse->priv->adapter));
2650 gst_adapter_clear (parse->priv->adapter);
2656 /* small helper that checks whether we have been trying to resync too long */
2657 static inline GstFlowReturn
2658 gst_base_parse_check_sync (GstBaseParse * parse)
2660 if (G_UNLIKELY (parse->priv->discont &&
2661 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2662 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2663 ("Failed to parse stream"), (NULL));
2664 return GST_FLOW_ERROR;
2670 static GstFlowReturn
2671 gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
2673 GstBaseParseClass *bclass;
2674 GstBaseParse *parse;
2675 GstFlowReturn ret = GST_FLOW_OK;
2676 GstBuffer *tmpbuf = NULL;
2681 GstClockTime pts, dts;
2683 parse = GST_BASE_PARSE (parent);
2684 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2686 if (parse->priv->detecting) {
2687 GstBuffer *detect_buf;
2689 if (parse->priv->detect_buffers_size == 0) {
2690 detect_buf = gst_buffer_ref (buffer);
2695 detect_buf = gst_buffer_new ();
2697 for (l = parse->priv->detect_buffers; l; l = l->next) {
2698 gsize tmpsize = gst_buffer_get_size (l->data);
2700 gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
2701 GST_BUFFER_COPY_MEMORY, offset, tmpsize);
2705 gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
2706 offset, gst_buffer_get_size (buffer));
2709 ret = bclass->detect (parse, detect_buf);
2710 gst_buffer_unref (detect_buf);
2712 if (ret == GST_FLOW_OK) {
2715 /* Detected something */
2716 parse->priv->detecting = FALSE;
2718 for (l = parse->priv->detect_buffers; l; l = l->next) {
2719 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2721 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2722 parent, GST_BUFFER_CAST (l->data));
2724 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2726 g_list_free (parse->priv->detect_buffers);
2727 parse->priv->detect_buffers = NULL;
2728 parse->priv->detect_buffers_size = 0;
2730 if (ret != GST_FLOW_OK) {
2734 /* Handle the current buffer */
2735 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2736 /* Still detecting, append buffer or error out if draining */
2738 if (parse->priv->drain) {
2739 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2740 return GST_FLOW_ERROR;
2741 } else if (parse->priv->flushing) {
2742 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2744 g_list_free (parse->priv->detect_buffers);
2745 parse->priv->detect_buffers = NULL;
2746 parse->priv->detect_buffers_size = 0;
2748 parse->priv->detect_buffers =
2749 g_list_append (parse->priv->detect_buffers, buffer);
2750 parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
2754 /* Something went wrong, subclass responsible for error reporting */
2758 /* And now handle the current buffer if detection worked */
2761 if (G_LIKELY (buffer)) {
2762 GST_LOG_OBJECT (parse,
2763 "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT
2764 ", dts %" GST_TIME_FORMAT ", pts %" GST_TIME_FORMAT,
2765 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer),
2766 GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
2767 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)));
2769 if (G_UNLIKELY (!parse->priv->disable_passthrough
2770 && parse->priv->passthrough)) {
2771 GstBaseParseFrame frame;
2773 gst_base_parse_frame_init (&frame);
2774 frame.buffer = gst_buffer_make_writable (buffer);
2775 ret = gst_base_parse_push_frame (parse, &frame);
2776 gst_base_parse_frame_free (&frame);
2779 /* upstream feeding us in reverse playback;
2780 * finish previous fragment and start new upon DISCONT */
2781 if (parse->segment.rate < 0.0) {
2782 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2783 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2784 ret = gst_base_parse_finish_fragment (parse, TRUE);
2785 gst_base_parse_start_fragment (parse);
2788 gst_adapter_push (parse->priv->adapter, buffer);
2791 /* Parse and push as many frames as possible */
2792 /* Stop either when adapter is empty or we are flushing */
2793 while (!parse->priv->flushing) {
2796 /* note: if subclass indicates MAX fsize,
2797 * this will not likely be available anyway ... */
2798 min_size = MAX (parse->priv->min_frame_size, fsize);
2799 av = gst_adapter_available (parse->priv->adapter);
2801 if (G_UNLIKELY (parse->priv->drain)) {
2803 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2804 if (G_UNLIKELY (!min_size)) {
2809 /* Collect at least min_frame_size bytes */
2810 if (av < min_size) {
2811 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)", av);
2815 /* move along with upstream timestamp (if any),
2816 * but interpolate in between */
2817 pts = gst_adapter_prev_pts (parse->priv->adapter, NULL);
2818 dts = gst_adapter_prev_dts (parse->priv->adapter, NULL);
2819 if (GST_CLOCK_TIME_IS_VALID (pts) && (parse->priv->prev_pts != pts))
2820 parse->priv->prev_pts = parse->priv->next_pts = pts;
2822 if (GST_CLOCK_TIME_IS_VALID (dts) && (parse->priv->prev_dts != dts))
2823 parse->priv->prev_dts = parse->priv->next_dts = dts;
2825 /* we can mess with, erm interpolate, timestamps,
2826 * and incoming stuff has PTS but no DTS seen so far,
2827 * then pick up DTS from PTS and hope for the best ... */
2828 if (parse->priv->infer_ts &&
2829 parse->priv->pts_interpolate &&
2830 !GST_CLOCK_TIME_IS_VALID (dts) &&
2831 !GST_CLOCK_TIME_IS_VALID (parse->priv->prev_dts) &&
2832 GST_CLOCK_TIME_IS_VALID (pts))
2833 parse->priv->next_dts = pts;
2835 /* always pass all available data */
2836 data = gst_adapter_map (parse->priv->adapter, av);
2837 /* arrange for actual data to be copied if subclass tries to,
2838 * since what is passed is tied to the adapter */
2839 tmpbuf = gst_buffer_new_wrapped_full (GST_MEMORY_FLAG_READONLY |
2840 GST_MEMORY_FLAG_NO_SHARE, (gpointer) data, av, 0, av, NULL, NULL);
2842 /* already inform subclass what timestamps we have planned,
2843 * at least if provided by time-based upstream */
2844 if (parse->priv->upstream_format == GST_FORMAT_TIME) {
2845 GST_BUFFER_PTS (tmpbuf) = parse->priv->next_pts;
2846 GST_BUFFER_DTS (tmpbuf) = parse->priv->next_dts;
2849 /* keep the adapter mapped, so keep track of what has to be flushed */
2850 ret = gst_base_parse_handle_buffer (parse, tmpbuf, &skip, &flush);
2853 /* probably already implicitly unmapped due to adapter operation,
2854 * but for good measure ... */
2855 gst_adapter_unmap (parse->priv->adapter);
2856 if (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED) {
2859 if (skip == 0 && flush == 0) {
2860 GST_LOG_OBJECT (parse, "nothing skipped and no frames finished, "
2861 "breaking to get more data");
2867 GST_LOG_OBJECT (parse, "chain leaving");
2871 /* pull @size bytes at current offset,
2872 * i.e. at least try to and possibly return a shorter buffer if near the end */
2873 static GstFlowReturn
2874 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2875 GstBuffer ** buffer)
2877 GstFlowReturn ret = GST_FLOW_OK;
2879 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2881 /* Caching here actually makes much less difference than one would expect.
2882 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2883 if (parse->priv->cache) {
2884 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2885 gint cache_size = gst_buffer_get_size (parse->priv->cache);
2887 if (cache_offset <= parse->priv->offset &&
2888 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2889 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
2890 parse->priv->offset - cache_offset, size);
2891 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2894 /* not enough data in the cache, free cache and get a new one */
2895 gst_buffer_unref (parse->priv->cache);
2896 parse->priv->cache = NULL;
2899 /* refill the cache */
2901 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2902 64 * 1024), &parse->priv->cache);
2903 if (ret != GST_FLOW_OK) {
2904 parse->priv->cache = NULL;
2908 if (gst_buffer_get_size (parse->priv->cache) >= size) {
2910 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0,
2912 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2916 /* Not possible to get enough data, try a last time with
2917 * requesting exactly the size we need */
2918 gst_buffer_unref (parse->priv->cache);
2919 parse->priv->cache = NULL;
2921 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2922 &parse->priv->cache);
2924 if (ret != GST_FLOW_OK) {
2925 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2930 if (gst_buffer_get_size (parse->priv->cache) < size) {
2931 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2932 G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
2933 parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
2935 *buffer = parse->priv->cache;
2936 parse->priv->cache = NULL;
2942 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
2943 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2948 static GstFlowReturn
2949 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2952 GstClockTime ts = 0;
2956 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2957 ", last_offset = %" G_GINT64_FORMAT,
2958 GST_TIME_ARGS (parse->priv->last_pts), parse->priv->last_offset);
2960 if (!parse->priv->last_offset
2961 || parse->priv->last_pts <= parse->segment.start) {
2962 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2963 GST_TIME_ARGS (parse->segment.start));
2968 /* last fragment started at last_offset / last_ts;
2969 * seek back 10s capped at 1MB */
2970 if (parse->priv->last_pts >= 10 * GST_SECOND)
2971 ts = parse->priv->last_pts - 10 * GST_SECOND;
2972 /* if we are exact now, we will be more so going backwards */
2973 if (parse->priv->exact_position) {
2974 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2976 if (!gst_base_parse_convert (parse, GST_FORMAT_TIME, ts,
2977 GST_FORMAT_BYTES, &offset)) {
2978 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2981 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2982 parse->priv->last_offset - 1024);
2983 offset = MAX (0, offset);
2985 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2987 parse->priv->offset = offset;
2989 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2991 if (ret != GST_FLOW_OK)
2994 /* offset will increase again as fragment is processed/parsed */
2995 parse->priv->last_offset = offset;
2997 gst_base_parse_start_fragment (parse);
2998 gst_adapter_push (parse->priv->adapter, buffer);
2999 ret = gst_base_parse_finish_fragment (parse, TRUE);
3000 if (ret != GST_FLOW_OK)
3003 /* force previous fragment */
3004 parse->priv->offset = -1;
3011 * pull and scan for next frame starting from current offset
3012 * ajusts sync, drain and offset going along */
3013 static GstFlowReturn
3014 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass)
3017 GstFlowReturn ret = GST_FLOW_OK;
3018 guint fsize, min_size;
3022 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
3023 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
3025 /* let's make this efficient for all subclass once and for all;
3026 * maybe it does not need this much, but in the latter case, we know we are
3027 * in pull mode here and might as well try to read and supply more anyway
3028 * (so does the buffer caching mechanism) */
3032 min_size = MAX (parse->priv->min_frame_size, fsize);
3034 GST_LOG_OBJECT (parse, "reading buffer size %u", min_size);
3036 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
3037 if (ret != GST_FLOW_OK)
3040 /* if we got a short read, inform subclass we are draining leftover
3041 * and no more is to be expected */
3042 if (gst_buffer_get_size (buffer) < min_size) {
3043 GST_LOG_OBJECT (parse, "... but did not get that; marked draining");
3044 parse->priv->drain = TRUE;
3047 if (parse->priv->detecting) {
3048 ret = klass->detect (parse, buffer);
3049 if (ret == GST_FLOW_NOT_NEGOTIATED) {
3050 /* If draining we error out, otherwise request a buffer
3052 if (parse->priv->drain) {
3053 gst_buffer_unref (buffer);
3054 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
3055 return GST_FLOW_ERROR;
3058 gst_buffer_unref (buffer);
3061 } else if (ret != GST_FLOW_OK) {
3062 gst_buffer_unref (buffer);
3063 GST_ERROR_OBJECT (parse, "detect() returned %s",
3064 gst_flow_get_name (ret));
3068 /* Else handle this buffer normally */
3071 ret = gst_base_parse_handle_buffer (parse, buffer, &skip, &flushed);
3072 if (ret != GST_FLOW_OK)
3075 /* something flushed means something happened,
3076 * and we should bail out of this loop so as not to occupy
3077 * the task thread indefinitely */
3079 GST_LOG_OBJECT (parse, "frame finished, breaking loop");
3082 /* nothing flushed, no skip and draining, so nothing left to do */
3083 if (!skip && parse->priv->drain) {
3084 GST_LOG_OBJECT (parse, "no activity or result when draining; "
3085 "breaking loop and marking EOS");
3089 /* otherwise, get some more data
3090 * note that is checked this does not happen indefinitely */
3092 GST_LOG_OBJECT (parse, "getting some more data");
3095 parse->priv->drain = FALSE;
3102 /* Loop that is used in pull mode to retrieve data from upstream */
3104 gst_base_parse_loop (GstPad * pad)
3106 GstBaseParse *parse;
3107 GstBaseParseClass *klass;
3108 GstFlowReturn ret = GST_FLOW_OK;
3110 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
3111 klass = GST_BASE_PARSE_GET_CLASS (parse);
3113 GST_LOG_OBJECT (parse, "Entering parse loop");
3115 if (G_UNLIKELY (parse->priv->push_stream_start)) {
3120 gst_pad_create_stream_id (parse->srcpad, GST_ELEMENT_CAST (parse),
3123 event = gst_event_new_stream_start (stream_id);
3124 gst_event_set_group_id (event, gst_util_group_id_next ());
3126 GST_DEBUG_OBJECT (parse, "Pushing STREAM_START");
3127 gst_pad_push_event (parse->srcpad, event);
3128 parse->priv->push_stream_start = FALSE;
3132 /* reverse playback:
3133 * first fragment (closest to stop time) is handled normally below,
3134 * then we pull in fragments going backwards */
3135 if (parse->segment.rate < 0.0) {
3136 /* check if we jumped back to a previous fragment,
3137 * which is a post-first fragment */
3138 if (parse->priv->offset < 0) {
3139 ret = gst_base_parse_handle_previous_fragment (parse);
3144 ret = gst_base_parse_scan_frame (parse, klass);
3145 if (ret != GST_FLOW_OK)
3148 /* eat expected eos signalling past segment in reverse playback */
3149 if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
3150 parse->segment.position >= parse->segment.stop) {
3151 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
3152 /* push what was accumulated during loop run */
3153 gst_base_parse_finish_fragment (parse, FALSE);
3154 /* force previous fragment */
3155 parse->priv->offset = -1;
3160 if (ret == GST_FLOW_EOS)
3162 else if (ret != GST_FLOW_OK)
3165 gst_object_unref (parse);
3172 GST_DEBUG_OBJECT (parse, "eos");
3177 gboolean push_eos = FALSE;
3179 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
3180 gst_flow_get_name (ret));
3181 gst_pad_pause_task (parse->sinkpad);
3183 if (ret == GST_FLOW_EOS) {
3184 /* handle end-of-stream/segment */
3185 if (parse->segment.flags & GST_SEGMENT_FLAG_SEGMENT) {
3188 if ((stop = parse->segment.stop) == -1)
3189 stop = parse->segment.duration;
3191 GST_DEBUG_OBJECT (parse, "sending segment_done");
3193 gst_element_post_message
3194 (GST_ELEMENT_CAST (parse),
3195 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
3196 GST_FORMAT_TIME, stop));
3197 gst_pad_push_event (parse->srcpad,
3198 gst_event_new_segment_done (GST_FORMAT_TIME, stop));
3200 /* If we STILL have zero frames processed, fire an error */
3201 if (parse->priv->framecount == 0) {
3202 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
3203 ("No valid frames found before end of stream"), (NULL));
3207 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
3208 /* for fatal errors we post an error message, wrong-state is
3209 * not fatal because it happens due to flushes and only means
3210 * that we should stop now. */
3211 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
3212 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
3216 /* Push pending events, including SEGMENT events */
3217 gst_base_parse_push_pending_events (parse);
3219 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
3221 gst_object_unref (parse);
3226 gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent)
3228 GstSchedulingFlags sched_flags;
3229 GstBaseParse *parse;
3233 parse = GST_BASE_PARSE (parent);
3235 GST_DEBUG_OBJECT (parse, "sink activate");
3237 query = gst_query_new_scheduling ();
3238 if (!gst_pad_peer_query (sinkpad, query)) {
3239 gst_query_unref (query);
3240 goto baseparse_push;
3243 gst_query_parse_scheduling (query, &sched_flags, NULL, NULL, NULL);
3245 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL)
3246 && ((sched_flags & GST_SCHEDULING_FLAG_SEEKABLE) != 0);
3248 gst_query_unref (query);
3251 goto baseparse_push;
3253 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
3254 if (!gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE))
3255 goto baseparse_push;
3257 parse->priv->push_stream_start = TRUE;
3259 return gst_pad_start_task (sinkpad, (GstTaskFunction) gst_base_parse_loop,
3264 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
3265 return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
3270 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
3272 GstBaseParseClass *klass;
3273 gboolean result = TRUE;
3275 GST_DEBUG_OBJECT (parse, "activate %d", active);
3277 klass = GST_BASE_PARSE_GET_CLASS (parse);
3280 if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start)
3281 result = klass->start (parse);
3283 /* If the subclass implements ::detect we want to
3284 * call it for the first buffers now */
3285 parse->priv->detecting = (klass->detect != NULL);
3287 /* We must make sure streaming has finished before resetting things
3288 * and calling the ::stop vfunc */
3289 GST_PAD_STREAM_LOCK (parse->sinkpad);
3290 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3292 if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop)
3293 result = klass->stop (parse);
3295 parse->priv->pad_mode = GST_PAD_MODE_NONE;
3297 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
3302 gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent,
3303 GstPadMode mode, gboolean active)
3306 GstBaseParse *parse;
3308 parse = GST_BASE_PARSE (parent);
3310 GST_DEBUG_OBJECT (parse, "sink %sactivate in %s mode",
3311 (active) ? "" : "de", gst_pad_mode_get_name (mode));
3313 if (!gst_base_parse_activate (parse, active))
3314 goto activate_failed;
3317 case GST_PAD_MODE_PULL:
3319 parse->priv->pending_events =
3320 g_list_prepend (parse->priv->pending_events,
3321 gst_event_new_segment (&parse->segment));
3322 parse->priv->pending_segment = TRUE;
3325 result = gst_pad_stop_task (pad);
3333 parse->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
3335 GST_DEBUG_OBJECT (parse, "sink activate return: %d", result);
3342 GST_DEBUG_OBJECT (parse, "activate failed");
3348 * gst_base_parse_set_duration:
3349 * @parse: #GstBaseParse.
3351 * @duration: duration value.
3352 * @interval: how often to update the duration estimate based on bitrate, or 0.
3354 * Sets the duration of the currently playing media. Subclass can use this
3355 * when it is able to determine duration and/or notices a change in the media
3356 * duration. Alternatively, if @interval is non-zero (default), then stream
3357 * duration is determined based on estimated bitrate, and updated every @interval
3361 gst_base_parse_set_duration (GstBaseParse * parse,
3362 GstFormat fmt, gint64 duration, gint interval)
3364 g_return_if_fail (parse != NULL);
3366 if (parse->priv->upstream_has_duration) {
3367 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3371 if (duration != parse->priv->duration) {
3374 m = gst_message_new_duration_changed (GST_OBJECT (parse));
3375 gst_element_post_message (GST_ELEMENT (parse), m);
3377 /* TODO: what about duration tag? */
3379 parse->priv->duration = duration;
3380 parse->priv->duration_fmt = fmt;
3381 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3382 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3383 if (interval != 0) {
3384 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3388 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3389 parse->priv->update_interval = interval;
3395 * gst_base_parse_set_average_bitrate:
3396 * @parse: #GstBaseParse.
3397 * @bitrate: average bitrate in bits/second
3399 * Optionally sets the average bitrate detected in media (if non-zero),
3400 * e.g. based on metadata, as it will be posted to the application.
3402 * By default, announced average bitrate is estimated. The average bitrate
3403 * is used to estimate the total duration of the stream and to estimate
3404 * a seek position, if there's no index and the format is syncable
3405 * (see gst_base_parse_set_syncable()).
3408 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3410 parse->priv->bitrate = bitrate;
3411 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3415 * gst_base_parse_set_min_frame_size:
3416 * @parse: #GstBaseParse.
3417 * @min_size: Minimum size of the data that this base class should give to
3420 * Subclass can use this function to tell the base class that it needs to
3421 * give at least #min_size buffers.
3424 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3426 g_return_if_fail (parse != NULL);
3428 parse->priv->min_frame_size = min_size;
3429 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3433 * gst_base_parse_set_frame_rate:
3434 * @parse: the #GstBaseParse to set
3435 * @fps_num: frames per second (numerator).
3436 * @fps_den: frames per second (denominator).
3437 * @lead_in: frames needed before a segment for subsequent decode
3438 * @lead_out: frames needed after a segment
3440 * If frames per second is configured, parser can take care of buffer duration
3441 * and timestamping. When performing segment clipping, or seeking to a specific
3442 * location, a corresponding decoder might need an initial @lead_in and a
3443 * following @lead_out number of frames to ensure the desired segment is
3444 * entirely filled upon decoding.
3447 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3448 guint fps_den, guint lead_in, guint lead_out)
3450 g_return_if_fail (parse != NULL);
3452 parse->priv->fps_num = fps_num;
3453 parse->priv->fps_den = fps_den;
3454 if (!fps_num || !fps_den) {
3455 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3457 fps_num = fps_den = 0;
3458 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3459 parse->priv->lead_in = parse->priv->lead_out = 0;
3460 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3462 parse->priv->frame_duration =
3463 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3464 parse->priv->lead_in = lead_in;
3465 parse->priv->lead_out = lead_out;
3466 parse->priv->lead_in_ts =
3467 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3468 parse->priv->lead_out_ts =
3469 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3470 /* aim for about 1.5s to estimate duration */
3471 if (parse->priv->update_interval < 0) {
3472 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3473 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3474 parse->priv->update_interval);
3477 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3478 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3479 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3480 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3481 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3482 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3486 * gst_base_parse_set_has_timing_info:
3487 * @parse: a #GstBaseParse
3488 * @has_timing: whether frames carry timing information
3490 * Set if frames carry timing information which the subclass can (generally)
3491 * parse and provide. In particular, intrinsic (rather than estimated) time
3492 * can be obtained following a seek.
3495 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3497 parse->priv->has_timing_info = has_timing;
3498 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3502 * gst_base_parse_set_syncable:
3503 * @parse: a #GstBaseParse
3504 * @syncable: set if frame starts can be identified
3506 * Set if frame starts can be identified. This is set by default and
3507 * determines whether seeking based on bitrate averages
3508 * is possible for a format/stream.
3511 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3513 parse->priv->syncable = syncable;
3514 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3518 * gst_base_parse_set_passthrough:
3519 * @parse: a #GstBaseParse
3520 * @passthrough: %TRUE if parser should run in passthrough mode
3522 * Set if the nature of the format or configuration does not allow (much)
3523 * parsing, and the parser should operate in passthrough mode (which only
3524 * applies when operating in push mode). That is, incoming buffers are
3525 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3526 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3527 * so subclass can perform as much or as little is appropriate for
3528 * passthrough semantics in @pre_push_frame.
3531 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3533 parse->priv->passthrough = passthrough;
3534 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3538 * gst_base_parse_set_pts_interpolation:
3539 * @parse: a #GstBaseParse
3540 * @pts_interpolate: %TRUE if parser should interpolate PTS timestamps
3542 * By default, the base class will guess PTS timestamps using a simple
3543 * interpolation (previous timestamp + duration), which is incorrect for
3544 * data streams with reordering, where PTS can go backward. Sub-classes
3545 * implementing such formats should disable PTS interpolation.
3548 gst_base_parse_set_pts_interpolation (GstBaseParse * parse,
3549 gboolean pts_interpolate)
3551 parse->priv->pts_interpolate = pts_interpolate;
3552 GST_INFO_OBJECT (parse, "PTS interpolation: %s",
3553 (pts_interpolate) ? "yes" : "no");
3557 * gst_base_parse_set_infer_ts:
3558 * @parse: a #GstBaseParse
3559 * @infer_ts: %TRUE if parser should infer DTS/PTS from each other
3561 * By default, the base class might try to infer PTS from DTS and vice
3562 * versa. While this is generally correct for audio data, it may not
3563 * be otherwise. Sub-classes implementing such formats should disable
3564 * timestamp inferring.
3567 gst_base_parse_set_infer_ts (GstBaseParse * parse, gboolean infer_ts)
3569 parse->priv->infer_ts = infer_ts;
3570 GST_INFO_OBJECT (parse, "TS inferring: %s", (infer_ts) ? "yes" : "no");
3574 * gst_base_parse_set_latency:
3575 * @parse: a #GstBaseParse
3576 * @min_latency: minimum parse latency
3577 * @max_latency: maximum parse latency
3579 * Sets the minimum and maximum (which may likely be equal) latency introduced
3580 * by the parsing process. If there is such a latency, which depends on the
3581 * particular parsing of the format, it typically corresponds to 1 frame duration.
3584 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3585 GstClockTime max_latency)
3587 GST_OBJECT_LOCK (parse);
3588 parse->priv->min_latency = min_latency;
3589 parse->priv->max_latency = max_latency;
3590 GST_OBJECT_UNLOCK (parse);
3591 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3592 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3593 GST_TIME_ARGS (max_latency));
3597 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3598 GstClockTime * duration)
3600 gboolean res = FALSE;
3602 g_return_val_if_fail (duration != NULL, FALSE);
3604 *duration = GST_CLOCK_TIME_NONE;
3605 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3606 GST_LOG_OBJECT (parse, "using provided duration");
3607 *duration = parse->priv->duration;
3609 } else if (parse->priv->duration != -1) {
3610 GST_LOG_OBJECT (parse, "converting provided duration");
3611 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3612 parse->priv->duration, format, (gint64 *) duration);
3613 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3614 GST_LOG_OBJECT (parse, "using estimated duration");
3615 *duration = parse->priv->estimated_duration;
3618 GST_LOG_OBJECT (parse, "cannot estimate duration");
3621 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3622 GST_TIME_ARGS (*duration));
3627 gst_base_parse_src_query_default (GstBaseParse * parse, GstQuery * query)
3629 gboolean res = FALSE;
3632 pad = GST_BASE_PARSE_SRC_PAD (parse);
3634 switch (GST_QUERY_TYPE (query)) {
3635 case GST_QUERY_POSITION:
3640 GST_DEBUG_OBJECT (parse, "position query");
3641 gst_query_parse_position (query, &format, NULL);
3643 /* try upstream first */
3644 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
3646 /* Fall back on interpreting segment */
3647 GST_OBJECT_LOCK (parse);
3648 if (format == GST_FORMAT_BYTES) {
3649 dest_value = parse->priv->offset;
3651 } else if (format == parse->segment.format &&
3652 GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
3653 dest_value = gst_segment_to_stream_time (&parse->segment,
3654 parse->segment.format, parse->segment.position);
3657 GST_OBJECT_UNLOCK (parse);
3659 /* no precise result, upstream no idea either, then best estimate */
3660 /* priv->offset is updated in both PUSH/PULL modes */
3661 res = gst_base_parse_convert (parse,
3662 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3665 gst_query_set_position (query, format, dest_value);
3669 case GST_QUERY_DURATION:
3672 GstClockTime duration;
3674 GST_DEBUG_OBJECT (parse, "duration query");
3675 gst_query_parse_duration (query, &format, NULL);
3677 /* consult upstream */
3678 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
3680 /* otherwise best estimate from us */
3682 res = gst_base_parse_get_duration (parse, format, &duration);
3684 gst_query_set_duration (query, format, duration);
3688 case GST_QUERY_SEEKING:
3691 GstClockTime duration = GST_CLOCK_TIME_NONE;
3692 gboolean seekable = FALSE;
3694 GST_DEBUG_OBJECT (parse, "seeking query");
3695 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3697 /* consult upstream */
3698 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
3700 /* we may be able to help if in TIME */
3701 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3702 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3703 /* already OK if upstream takes care */
3704 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3706 if (!(res && seekable)) {
3707 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3708 || duration == -1) {
3709 /* seekable if we still have a chance to get duration later on */
3711 parse->priv->upstream_seekable && parse->priv->update_interval;
3713 seekable = parse->priv->upstream_seekable;
3714 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3717 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3723 case GST_QUERY_FORMATS:
3724 gst_query_set_formatsv (query, 3, fmtlist);
3727 case GST_QUERY_CONVERT:
3729 GstFormat src_format, dest_format;
3730 gint64 src_value, dest_value;
3732 gst_query_parse_convert (query, &src_format, &src_value,
3733 &dest_format, &dest_value);
3735 res = gst_base_parse_convert (parse, src_format, src_value,
3736 dest_format, &dest_value);
3738 gst_query_set_convert (query, src_format, src_value,
3739 dest_format, dest_value);
3743 case GST_QUERY_LATENCY:
3745 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3747 GstClockTime min_latency, max_latency;
3749 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3750 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3751 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3752 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3754 GST_OBJECT_LOCK (parse);
3755 /* add our latency */
3756 if (min_latency != -1)
3757 min_latency += parse->priv->min_latency;
3758 if (max_latency != -1)
3759 max_latency += parse->priv->max_latency;
3760 GST_OBJECT_UNLOCK (parse);
3762 gst_query_set_latency (query, live, min_latency, max_latency);
3766 case GST_QUERY_SEGMENT:
3771 format = parse->segment.format;
3774 gst_segment_to_stream_time (&parse->segment, format,
3775 parse->segment.start);
3776 if ((stop = parse->segment.stop) == -1)
3777 stop = parse->segment.duration;
3779 stop = gst_segment_to_stream_time (&parse->segment, format, stop);
3781 gst_query_set_segment (query, parse->segment.rate, format, start, stop);
3786 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
3792 /* scans for a cluster start from @pos,
3793 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3794 static GstFlowReturn
3795 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3796 GstClockTime * time, GstClockTime * duration)
3798 GstBaseParseClass *klass;
3800 gboolean orig_drain, orig_discont;
3801 GstFlowReturn ret = GST_FLOW_OK;
3802 GstBuffer *buf = NULL;
3803 GstBaseParseFrame *sframe = NULL;
3805 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3806 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3807 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3809 klass = GST_BASE_PARSE_GET_CLASS (parse);
3811 *time = GST_CLOCK_TIME_NONE;
3812 *duration = GST_CLOCK_TIME_NONE;
3815 orig_offset = parse->priv->offset;
3816 orig_discont = parse->priv->discont;
3817 orig_drain = parse->priv->drain;
3819 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3820 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3822 /* jump elsewhere and locate next frame */
3823 parse->priv->offset = *pos;
3824 /* mark as scanning so frames don't get processed all the way */
3825 parse->priv->scanning = TRUE;
3826 ret = gst_base_parse_scan_frame (parse, klass);
3827 parse->priv->scanning = FALSE;
3828 /* retrieve frame found during scan */
3829 sframe = parse->priv->scanned_frame;
3830 parse->priv->scanned_frame = NULL;
3832 if (ret != GST_FLOW_OK || !sframe)
3835 /* get offset first, subclass parsing might dump other stuff in there */
3836 *pos = sframe->offset;
3837 buf = sframe->buffer;
3840 /* but it should provide proper time */
3841 *time = GST_BUFFER_TIMESTAMP (buf);
3842 *duration = GST_BUFFER_DURATION (buf);
3844 GST_LOG_OBJECT (parse,
3845 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3846 GST_TIME_ARGS (*time), *pos);
3850 gst_base_parse_frame_free (sframe);
3853 parse->priv->offset = orig_offset;
3854 parse->priv->discont = orig_discont;
3855 parse->priv->drain = orig_drain;
3860 /* bisect and scan through file for frame starting before @time,
3861 * returns OK and @time/@offset if found, NONE and/or error otherwise
3862 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3863 static GstFlowReturn
3864 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3867 GstFlowReturn ret = GST_FLOW_OK;
3868 gint64 lpos, hpos, newpos;
3869 GstClockTime time, ltime, htime, newtime, dur;
3870 gboolean cont = TRUE;
3871 const GstClockTime tolerance = TARGET_DIFFERENCE;
3872 const guint chunk = 4 * 1024;
3874 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3875 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3877 GST_DEBUG_OBJECT (parse, "Bisecting for time %" GST_TIME_FORMAT,
3878 GST_TIME_ARGS (*_time));
3880 /* TODO also make keyframe aware if useful some day */
3895 /* do not know at first */
3897 *_time = GST_CLOCK_TIME_NONE;
3899 /* need initial positions; start and end */
3900 lpos = parse->priv->first_frame_offset;
3901 ltime = parse->priv->first_frame_pts;
3902 /* try other one if no luck */
3903 if (!GST_CLOCK_TIME_IS_VALID (ltime))
3904 ltime = parse->priv->first_frame_dts;
3905 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &htime)) {
3906 GST_DEBUG_OBJECT (parse, "Unknown time duration, cannot bisect");
3907 return GST_FLOW_ERROR;
3909 hpos = parse->priv->upstream_size;
3911 GST_DEBUG_OBJECT (parse,
3912 "Bisection initial bounds: bytes %" G_GINT64_FORMAT " %" G_GINT64_FORMAT
3913 ", times %" GST_TIME_FORMAT " %" GST_TIME_FORMAT, lpos, hpos,
3914 GST_TIME_ARGS (ltime), GST_TIME_ARGS (htime));
3916 /* check preconditions are satisfied;
3917 * start and end are needed, except for special case where we scan for
3918 * last frame to determine duration */
3919 if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos ||
3920 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3921 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3925 /* shortcut cases */
3928 } else if (time < ltime + tolerance) {
3932 } else if (time >= htime) {
3938 while (htime > ltime && cont) {
3939 GST_LOG_OBJECT (parse,
3940 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3941 GST_TIME_ARGS (ltime));
3942 GST_LOG_OBJECT (parse,
3943 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3944 GST_TIME_ARGS (htime));
3945 if (G_UNLIKELY (time == G_MAXINT64)) {
3947 } else if (G_LIKELY (hpos > lpos)) {
3949 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3952 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3954 /* we check this case once, but not forever, so break loop */
3959 newpos = CLAMP (newpos, lpos, hpos);
3960 GST_LOG_OBJECT (parse,
3961 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3962 GST_TIME_ARGS (time), newpos);
3964 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3965 if (ret == GST_FLOW_EOS) {
3966 /* heuristic HACK */
3967 hpos = MAX (lpos, hpos - chunk);
3969 } else if (ret != GST_FLOW_OK) {
3973 if (newtime == -1 || newpos == -1) {
3974 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3978 if (G_UNLIKELY (time == G_MAXINT64)) {
3981 if (GST_CLOCK_TIME_IS_VALID (dur))
3984 } else if (newtime > time) {
3986 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3988 } else if (newtime + tolerance > time) {
3989 /* close enough undershoot */
3993 } else if (newtime < ltime) {
3994 /* so a position beyond lpos resulted in earlier time than ltime ... */
3995 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3998 /* undershoot too far */
3999 newpos += newpos == lpos ? chunk : 0;
4000 lpos = CLAMP (newpos, lpos, hpos);
4006 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
4007 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
4012 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
4013 gboolean before, GstClockTime * _ts)
4015 gint64 bytes = 0, ts = 0;
4016 GstIndexEntry *entry = NULL;
4018 if (time == GST_CLOCK_TIME_NONE) {
4024 GST_BASE_PARSE_INDEX_LOCK (parse);
4025 if (parse->priv->index) {
4026 /* Let's check if we have an index entry for that time */
4027 entry = gst_index_get_assoc_entry (parse->priv->index,
4028 parse->priv->index_id,
4029 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
4030 GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
4034 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
4035 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
4037 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
4038 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
4039 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
4041 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
4042 GST_TIME_ARGS (time));
4045 ts = GST_CLOCK_TIME_NONE;
4048 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4057 /* returns TRUE if seek succeeded */
4059 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
4064 GstSeekType start_type = GST_SEEK_TYPE_NONE, stop_type;
4065 gboolean flush, update, res = TRUE, accurate;
4066 gint64 start, stop, seekpos, seekstop;
4067 GstSegment seeksegment = { 0, };
4068 GstClockTime start_ts;
4070 GstEvent *segment_event;
4072 /* try upstream first, unless we're driving the streaming thread ourselves */
4073 if (parse->priv->pad_mode != GST_PAD_MODE_PULL) {
4074 res = gst_pad_push_event (parse->sinkpad, gst_event_ref (event));
4079 gst_event_parse_seek (event, &rate, &format, &flags,
4080 &start_type, &start, &stop_type, &stop);
4081 seqnum = gst_event_get_seqnum (event);
4083 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
4084 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
4085 GST_TIME_FORMAT, gst_format_get_name (format), rate,
4086 start_type, GST_TIME_ARGS (start), stop_type, GST_TIME_ARGS (stop));
4088 /* we can only handle TIME, so check if subclass can convert
4089 * to TIME format if it's some other format (such as DEFAULT) */
4090 if (format != GST_FORMAT_TIME) {
4091 if (!gst_base_parse_convert (parse, format, start, GST_FORMAT_TIME, &start)
4092 || !gst_base_parse_convert (parse, format, stop, GST_FORMAT_TIME,
4094 goto no_convert_to_time;
4096 GST_INFO_OBJECT (parse, "converted %s format to start time "
4097 "%" GST_TIME_FORMAT " and stop time %" GST_TIME_FORMAT,
4098 gst_format_get_name (format), GST_TIME_ARGS (start),
4099 GST_TIME_ARGS (stop));
4101 format = GST_FORMAT_TIME;
4104 /* no negative rates in push mode (unless upstream takes care of that, but
4105 * we've already tried upstream and it didn't handle the seek request) */
4106 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH)
4109 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PULL)
4110 goto negative_rate_pull_mode;
4112 if (start_type != GST_SEEK_TYPE_SET ||
4113 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
4116 /* get flush flag */
4117 flush = flags & GST_SEEK_FLAG_FLUSH;
4119 /* copy segment, we need this because we still need the old
4120 * segment when we close the current segment. */
4121 gst_segment_copy_into (&parse->segment, &seeksegment);
4123 GST_DEBUG_OBJECT (parse, "configuring seek");
4124 gst_segment_do_seek (&seeksegment, rate, format, flags,
4125 start_type, start, stop_type, stop, &update);
4127 /* accurate seeking implies seek tables are used to obtain position,
4128 * and the requested segment is maintained exactly, not adjusted any way */
4129 accurate = flags & GST_SEEK_FLAG_ACCURATE;
4131 /* maybe we can be accurate for (almost) free */
4132 gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
4133 if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
4134 GST_DEBUG_OBJECT (parse, "accurate seek possible");
4138 GstClockTime startpos = seeksegment.position;
4140 /* accurate requested, so ... seek a bit before target */
4141 if (startpos < parse->priv->lead_in_ts)
4144 startpos -= parse->priv->lead_in_ts;
4145 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
4146 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
4149 start_ts = seeksegment.position;
4150 if (!gst_base_parse_convert (parse, format, seeksegment.position,
4151 GST_FORMAT_BYTES, &seekpos))
4152 goto convert_failed;
4153 if (!gst_base_parse_convert (parse, format, seeksegment.stop,
4154 GST_FORMAT_BYTES, &seekstop))
4155 goto convert_failed;
4158 GST_DEBUG_OBJECT (parse,
4159 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
4161 GST_DEBUG_OBJECT (parse,
4162 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
4163 seeksegment.stop, seekstop);
4165 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
4168 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
4171 if (parse->srcpad) {
4172 GstEvent *fevent = gst_event_new_flush_start ();
4173 GST_DEBUG_OBJECT (parse, "sending flush start");
4175 gst_event_set_seqnum (fevent, seqnum);
4177 gst_pad_push_event (parse->srcpad, gst_event_ref (fevent));
4178 /* unlock upstream pull_range */
4179 gst_pad_push_event (parse->sinkpad, fevent);
4182 gst_pad_pause_task (parse->sinkpad);
4185 /* we should now be able to grab the streaming thread because we stopped it
4186 * with the above flush/pause code */
4187 GST_PAD_STREAM_LOCK (parse->sinkpad);
4189 /* save current position */
4190 last_stop = parse->segment.position;
4191 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
4194 /* now commit to new position */
4196 /* prepare for streaming again */
4198 GstEvent *fevent = gst_event_new_flush_stop (TRUE);
4199 GST_DEBUG_OBJECT (parse, "sending flush stop");
4200 gst_event_set_seqnum (fevent, seqnum);
4201 gst_pad_push_event (parse->srcpad, gst_event_ref (fevent));
4202 gst_pad_push_event (parse->sinkpad, fevent);
4203 gst_base_parse_clear_queues (parse);
4205 /* keep track of our position */
4206 seeksegment.base = gst_segment_to_running_time (&seeksegment,
4207 seeksegment.format, parse->segment.position);
4210 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
4212 /* store the newsegment event so it can be sent from the streaming thread. */
4213 /* This will be sent later in _loop() */
4214 parse->priv->pending_segment = TRUE;
4215 segment_event = gst_event_new_segment (&parse->segment);
4216 gst_event_set_seqnum (segment_event, seqnum);
4217 parse->priv->pending_events =
4218 g_list_prepend (parse->priv->pending_events, segment_event);
4220 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
4221 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
4222 ", time = %" GST_TIME_FORMAT, format,
4223 GST_TIME_ARGS (parse->segment.start),
4224 GST_TIME_ARGS (parse->segment.stop),
4225 GST_TIME_ARGS (parse->segment.time));
4227 /* one last chance in pull mode to stay accurate;
4228 * maybe scan and subclass can find where to go */
4231 GstClockTime ts = seeksegment.position;
4233 gst_base_parse_locate_time (parse, &ts, &scanpos);
4237 /* running collected index now consists of several intervals,
4238 * so optimized check no longer possible */
4239 parse->priv->index_last_valid = FALSE;
4240 parse->priv->index_last_offset = 0;
4241 parse->priv->index_last_ts = 0;
4245 /* mark discont if we are going to stream from another position. */
4246 if (seekpos != parse->priv->offset) {
4247 GST_DEBUG_OBJECT (parse,
4248 "mark DISCONT, we did a seek to another position");
4249 parse->priv->offset = seekpos;
4250 parse->priv->last_offset = seekpos;
4251 parse->priv->seen_keyframe = FALSE;
4252 parse->priv->discont = TRUE;
4253 parse->priv->next_dts = start_ts;
4254 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
4255 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
4256 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
4257 parse->priv->sync_offset = seekpos;
4258 parse->priv->exact_position = accurate;
4261 /* Start streaming thread if paused */
4262 gst_pad_start_task (parse->sinkpad,
4263 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad, NULL);
4265 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
4270 GstEvent *new_event;
4271 GstBaseParseSeek *seek;
4272 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
4274 /* The only thing we need to do in PUSH-mode is to send the
4275 seek event (in bytes) to upstream. Segment / flush handling happens
4276 in corresponding src event handlers */
4277 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
4278 if (seekstop >= 0 && seekstop <= seekpos)
4280 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
4281 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
4282 gst_event_set_seqnum (new_event, seqnum);
4284 /* store segment info so its precise details can be reconstructed when
4285 * receiving newsegment;
4286 * this matters for all details when accurate seeking,
4287 * is most useful to preserve NONE stop time otherwise */
4288 seek = g_new0 (GstBaseParseSeek, 1);
4289 seek->segment = seeksegment;
4290 seek->accurate = accurate;
4291 seek->offset = seekpos;
4292 seek->start_ts = start_ts;
4293 GST_OBJECT_LOCK (parse);
4294 /* less optimal, but preserves order */
4295 parse->priv->pending_seeks =
4296 g_slist_append (parse->priv->pending_seeks, seek);
4297 GST_OBJECT_UNLOCK (parse);
4299 res = gst_pad_push_event (parse->sinkpad, new_event);
4302 GST_OBJECT_LOCK (parse);
4303 parse->priv->pending_seeks =
4304 g_slist_remove (parse->priv->pending_seeks, seek);
4305 GST_OBJECT_UNLOCK (parse);
4311 gst_event_unref (event);
4315 negative_rate_pull_mode:
4317 GST_FIXME_OBJECT (parse, "negative playback in pull mode needs fixing");
4323 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
4329 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
4335 GST_DEBUG_OBJECT (parse, "seek in %s format was requested, but subclass "
4336 "couldn't convert that into TIME format", gst_format_get_name (format));
4342 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
4348 /* Checks if bitrates are available from upstream tags so that we don't
4349 * override them later
4352 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
4354 GstTagList *taglist = NULL;
4357 gst_event_parse_tag (event, &taglist);
4359 /* We only care about stream tags here */
4360 if (gst_tag_list_get_scope (taglist) != GST_TAG_SCOPE_STREAM)
4363 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
4364 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
4365 parse->priv->post_min_bitrate = FALSE;
4367 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
4368 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
4369 parse->priv->post_avg_bitrate = FALSE;
4371 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
4372 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
4373 parse->priv->post_max_bitrate = FALSE;
4379 gst_base_parse_set_index (GstElement * element, GstIndex * index)
4381 GstBaseParse *parse = GST_BASE_PARSE (element);
4383 GST_BASE_PARSE_INDEX_LOCK (parse);
4384 if (parse->priv->index)
4385 gst_object_unref (parse->priv->index);
4387 parse->priv->index = gst_object_ref (index);
4388 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4389 &parse->priv->index_id);
4390 parse->priv->own_index = FALSE;
4392 parse->priv->index = NULL;
4394 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4398 gst_base_parse_get_index (GstElement * element)
4400 GstBaseParse *parse = GST_BASE_PARSE (element);
4401 GstIndex *result = NULL;
4403 GST_BASE_PARSE_INDEX_LOCK (parse);
4404 if (parse->priv->index)
4405 result = gst_object_ref (parse->priv->index);
4406 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4412 static GstStateChangeReturn
4413 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4415 GstBaseParse *parse;
4416 GstStateChangeReturn result;
4418 parse = GST_BASE_PARSE (element);
4420 switch (transition) {
4421 case GST_STATE_CHANGE_READY_TO_PAUSED:
4422 /* If this is our own index destroy it as the
4423 * old entries might be wrong for the new stream */
4424 GST_BASE_PARSE_INDEX_LOCK (parse);
4425 if (parse->priv->own_index) {
4426 gst_object_unref (parse->priv->index);
4427 parse->priv->index = NULL;
4428 parse->priv->own_index = FALSE;
4431 /* If no index was created, generate one */
4432 if (G_UNLIKELY (!parse->priv->index)) {
4433 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4435 parse->priv->index = g_object_new (gst_mem_index_get_type (), NULL);
4436 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4437 &parse->priv->index_id);
4438 parse->priv->own_index = TRUE;
4440 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4446 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4448 switch (transition) {
4449 case GST_STATE_CHANGE_PAUSED_TO_READY:
4450 gst_base_parse_reset (parse);
4460 * gst_base_parse_set_ts_at_offset:
4461 * @parse: a #GstBaseParse
4462 * @offset: offset into current buffer
4464 * This function should only be called from a @handle_frame implementation.
4466 * GstBaseParse creates initial timestamps for frames by using the last
4467 * timestamp seen in the stream before the frame starts. In certain
4468 * cases, the correct timestamps will occur in the stream after the
4469 * start of the frame, but before the start of the actual picture data.
4470 * This function can be used to set the timestamps based on the offset
4471 * into the frame data that the picture starts.
4476 gst_base_parse_set_ts_at_offset (GstBaseParse * parse, gsize offset)
4478 GstClockTime pts, dts;
4480 g_return_if_fail (GST_IS_BASE_PARSE (parse));
4481 g_return_if_fail (offset >= 0);
4483 pts = gst_adapter_prev_pts_at_offset (parse->priv->adapter, offset, NULL);
4484 dts = gst_adapter_prev_dts_at_offset (parse->priv->adapter, offset, NULL);
4486 if (!GST_CLOCK_TIME_IS_VALID (pts) || !GST_CLOCK_TIME_IS_VALID (dts)) {
4487 GST_DEBUG_OBJECT (parse,
4488 "offset adapter timestamps dts=%" GST_TIME_FORMAT " pts=%"
4489 GST_TIME_FORMAT, GST_TIME_ARGS (dts), GST_TIME_ARGS (pts));
4491 if (GST_CLOCK_TIME_IS_VALID (pts) && (parse->priv->prev_pts != pts))
4492 parse->priv->prev_pts = parse->priv->next_pts = pts;
4494 if (GST_CLOCK_TIME_IS_VALID (dts) && (parse->priv->prev_dts != dts))
4495 parse->priv->prev_dts = parse->priv->next_dts = dts;